CN208026964U - Lens unit and optical unit - Google Patents
Lens unit and optical unit Download PDFInfo
- Publication number
- CN208026964U CN208026964U CN201820468462.XU CN201820468462U CN208026964U CN 208026964 U CN208026964 U CN 208026964U CN 201820468462 U CN201820468462 U CN 201820468462U CN 208026964 U CN208026964 U CN 208026964U
- Authority
- CN
- China
- Prior art keywords
- lens unit
- lens
- retainer
- thread
- screw thread
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 36
- 230000002093 peripheral effect Effects 0.000 claims abstract description 21
- 125000003003 spiro group Chemical group 0.000 claims abstract description 3
- 239000011347 resin Substances 0.000 claims description 8
- 229920005989 resin Polymers 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000000465 moulding Methods 0.000 description 5
- 238000007789 sealing Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000009738 saturating Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- Lens Barrels (AREA)
Abstract
A kind of lens unit and the optical unit including the lens unit, even if the externally threaded major diameter formed on the lens barrel peripheral surface of lens unit is too small or the path of internal thread that is formed on lens unit retainer is excessive, it is also avoided that the too small situation of the screw thread torque that the when of twisting the lens barrel of lens unit relative to lens unit retainer in the state of assembling lens unit and lens unit retainer generates.The lens unit of the utility model has lens and the lens is held in the lens barrel of inside, the external screw thread with the internal screw-thread screw of lens unit retainer is formed on the peripheral surface of the lens barrel, wherein, at least one protrusion contacted with the internal thread of the lens unit retainer is formed on the external screw thread.The optical unit of the utility model includes said lens unit and lens unit retainer, which is formed with the internal thread with the external thread spiro fastening of the lens unit, and is equipped with capturing element.
Description
Technical field
The utility model is related to lens unit and the optical unit with the lens unit.
Background technology
In the past, there is a kind of optical unit, with lens unit and lens unit retainer, wherein the lens unit
It is held in the lens barrel of inside with multiple lens and by this multiple lens, outer spiral shell is formed on the peripheral surface of the lens barrel
Line, the lens unit retainer has the internal thread with the external thread spiro fastening of the lens unit, and is equipped with capturing element.
In being protected in use, the external screw thread to the lens barrel of lens unit is usually needed to be screwed into lens unit for above-mentioned optical unit
The amount for holding the internal thread of frame is adjusted, between the capturing element on the lens in lens barrel and lens unit retainer away from
From being adjusted, to carry out focus adjustment.
When carrying out above-mentioned focus adjustment, the external screw thread for overcoming the lens barrel because of lens unit and lens unit retainer are needed
Internal thread between friction and the screw thread torque that generates, to ensure that above-mentioned focus adjustment can be carried out cosily, in general, above-mentioned spiral shell
Line torque needs meet certain size in entire adjustable range of the lens unit relative to lens unit retainer.
In the past, in order to ensure screw thread torque is in entire adjustable range of the lens unit relative to lens unit retainer
Meet certain size, it is often necessary to which the external screw thread and lens unit strictly controlled on the lens barrel peripheral surface of lens unit is kept
The dimensional accuracy of the internal thread of frame.
However, using lens barrel, lens unit retainer of the molding machine to form lens unit, even exist
In continuously shaped, it is again started up before and after the time point that molding machine needs to be serviced or after molding machine break-off
When, it is also difficult to ensure the size of molded thread.
Even if in addition, using mold come the lens barrel of molded lens unit, lens unit retainer, the thread molded
Crest shape and tooth Bottom Shape can also have differences, even if usually will appear screw thread torque not if the diameter of thread is identical
Same situation.
Thus, for example, being susceptible to the externally threaded major diameter because being molded on the lens barrel peripheral surface of lens unit in the past
The path of too small or lens unit retainer internal thread it is excessive and cause the lens barrel of lens unit and lens unit retainer it
Between it is excessively loose, so as to cause the too small situation of screw thread torque.
Utility model content
The utility model precisely in order to solve described problem and complete, and it is an object of the present invention to provide a kind of optical unit, even if
The externally threaded major diameter formed on the lens barrel peripheral surface of lens unit is too small or in being formed on lens unit retainer
The path of screw thread is excessive, is also avoided that in the state of assembling lens unit and lens unit retainer relative to lens unit
Retainer twists the too small situation of the screw thread torque generated when the lens barrel of lens unit.
To achieve the goals above, the first aspect of the utility model provides a kind of lens unit, has：Lens；With
And the lens are held in the lens barrel of inside, the interior spiral shell with lens unit retainer is formed on the peripheral surface of the lens barrel
The external screw thread that line screws togather, wherein be formed on the external screw thread contacted with the internal thread of the lens unit retainer to
A few protrusion.
The spiral shell generated by the friction between the external screw thread of the lens barrel of lens unit and the internal thread of lens unit retainer
The size of line torque and the friction generated between the external screw thread and the internal thread of lens unit retainer of the lens barrel of lens unit
Power is directly proportional.
Lens unit according to the present utility model is kept by being formed on the external screw thread of lens barrel peripheral surface with lens unit
At least one protrusion of the internal thread contact of frame contributes in the state of assembling lens unit and lens unit retainer
Increase the contact area between the external screw thread and the internal thread of lens unit retainer of the lens barrel of lens unit, to increase two
The frictional force generated between person, and then increase the spiral shell generated when twisting the lens barrel of lens unit relative to lens unit retainer
Line torque, therefore, even if the externally threaded major diameter formed on the lens barrel peripheral surface of lens unit is too small or in lens unit
The path of the internal thread formed on retainer is excessive, is also avoided that in the state for assembling lens unit and lens unit retainer
Under the too small situation of the screw thread torque that generates when twisting the lens barrel of lens unit relative to lens unit retainer, even if lens list
The dimensional discrepancy of the external screw thread of the lens barrel peripheral surface of member and/or the internal thread of lens unit retainer is larger, also can easily expire
The high-precision screw thread torque demand of foot.
In addition, in the lens unit of the utility model, the preferably described protrusion is formed in the externally threaded thread
Side.
Lens unit according to the present utility model, with phase the case where forming protrusion at the crest of externally threaded thread
Than being easy to form protrusion using mold, also, be easy really in the state of assembling lens unit and lens unit retainer
Protect the contact area of the protrusion on lens barrel and the internal thread on lens unit retainer.
In addition, in the lens unit of the utility model, the preferably described protrusion is formed in the externally threaded thread
Tooth bottom.
Lens unit according to the present utility model, with phase the case where forming protrusion at the crest of externally threaded thread
Than being easy to form protrusion using mold, also, be easy really in the state of assembling lens unit and lens unit retainer
Protect the contact area of the protrusion on lens barrel and the internal thread on lens unit retainer.
In addition, in the lens unit of the utility model, multiple institutes preferably equidistantly have been formed on the external screw thread
State protrusion.
Lens unit according to the present utility model is opposite in the state of assembling lens unit and lens unit retainer
When lens unit retainer twists the lens barrel of lens unit, help to make that focus adjustment is steady, accurately carries out.
In addition, in the lens unit of above structure, can be used with lower structure：Multiple protrusion arrangement forms with institute
On the straight line for stating externally threaded centerline parallel.
According to the lens unit of above structure, protrusion can be easily formed on the peripheral surface of the lens barrel of lens unit, had
Help reduce manufacturing cost.
In addition, in the lens unit of above structure, also can be used with lower structure：Multiple protrusion arrangement forms with
On a plurality of straight line of the externally threaded centerline parallel, a plurality of straight line centered on the externally threaded center line with etc.
Angle spacing is distributed.
According to the lens unit of above structure, in the state of assembling lens unit and lens unit retainer relative to
When lens unit retainer twists the lens barrel of lens unit, help to make that focus adjustment is steady, accurately carries out.
In addition, in the lens unit of the utility model, the preferably described external screw thread is formed with multi-turn.
Lens unit according to the present utility model, in the state of assembling lens unit and lens unit retainer, energy
Increase focus adjustment range.
In addition, in the lens unit of the utility model, the preferably described lens barrel is the resin by being molded type.
Lens unit according to the present utility model, with by being machined to manufacture lens barrel the case where compared with, help to drop
Low manufacturing cost.
In addition, to achieve the goals above, the second aspect of the utility model provides a kind of optical unit comprising：On
The lens unit stated；And lens unit retainer, the lens unit retainer are formed with the external screw thread with the lens unit
The internal thread screwed togather, and capturing element is installed.
(utility model effect)
According to the utility model, by forming the internal thread with lens unit retainer on the external screw thread of lens barrel peripheral surface
At least one protrusion of contact helps to increase lens list in the state of assembling lens unit and lens unit retainer
Contact area between the external screw thread and the internal thread of lens unit retainer of the lens barrel of member generates therebetween to increase
Frictional force, and then increase the screw thread torque that is generated when twisting the lens barrel of lens unit relative to lens unit retainer, because
This, even if the externally threaded major diameter formed on the lens barrel peripheral surface of lens unit it is too small or on lens unit retainer shape
At internal thread path it is excessive, be also avoided that in the state of assembling lens unit and lens unit retainer relative to saturating
Mirror unit retainer twists the too small situation of the screw thread torque generated when the lens barrel of lens unit, even if outside the lens barrel of lens unit
The dimensional discrepancy of the external screw thread of circumferential surface and/or the internal thread of lens unit retainer is larger, also can easily meet high-precision
Screw thread torque demand.
Description of the drawings
Fig. 1 is the integrally-built sectional view for the optical unit for schematically illustrating the utility model.
Fig. 2 is the shape in the portion perimeter face of the lens barrel of the lens unit in the optical unit for schematically illustrate the utility model
Side view.
Fig. 3 is the shape in the portion perimeter face of the lens barrel of the lens unit in the optical unit for schematically illustrate the utility model
Front view.
(symbol description)
100 lens units
11 lens
12 lens
13 lens
14 lens
15 lens
16 lens
17 lens
20 lens barrels
21 cylindrical body parts
211 external screw threads
212 protrusions
22 annular flange portions
23 major diameter canister portions
24 annular base plate portions
25 circular step portions
26 annular recess
27 annular recess
30 retainers
50 barn doors
60 apertures
70 infrared filters
80 sealing rings
200 lens unit retainers
Specific implementation mode
In the following, in conjunction with Fig. 1 to Fig. 3, the embodiment of the optical unit of the utility model is illustrated.
In the following description, " object side L1 " and " image side L2 " refer to object side on optical axis L direction (below sometimes
Referred to as front side) and image side (following sometimes referred to as rear side), also, " optical axis direction " refers to the direction parallel with optical axis L.
Fig. 1 is the integrally-built sectional view for the optical unit for schematically illustrating the utility model, and Fig. 2 is to schematically illustrate this
The side view of the shape in the portion perimeter face of the lens barrel of the lens unit in the optical unit of utility model, Fig. 3 are to schematically illustrate
The front view of the shape in the portion perimeter face of the lens barrel of the lens unit in the optical unit of the utility model.
As shown in Figure 1, optical unit includes lens unit 100 and lens unit retainer 200, wherein lens unit 100
The lens barrel 20 of inside is held in multiple lens and by this multiple lens, as shown in Figures 2 and 3, in the peripheral surface of lens barrel 20
On be formed with external screw thread 211, also, lens unit retainer 2 has the internal thread that the external screw thread 211 with lens unit 1 screws togather
(not shown), and capturing element (not shown) is installed.
Herein, lens unit 100 includes seven lens arranged along optical axis direction, is lens successively from the L1 of object side
11, lens 12, lens 13, lens 14, lens 15, lens 16 and lens 17, also, be provided between lens 12 and lens 13
Barn door 50 is provided with aperture 60 between lens 14 and lens 15, infrared being configured with by the position of image side L2 than lens 17
Line optical filter 70.Specifically, lens 11 have negative focal power (power), the surface of object side L1 is convex, image side L2
Surface (central part) it is concave；Lens 12 have negative focal power, and the surface of object side L1 is convex, the table of image side L2
Face (central part) is concave；Lens 13 have negative focal power, and the surface of object side L1 is concave, and the surface of image side L2 is in
Convex；Lens 14 have positive focal power, and the surface (central part) of object side L1 is convex, the surface of image side L2 (in
Center portion) it is convex；Lens 15 have positive focal power, and the surface of object side L1 is convex, and the surface of image side L2 is also convex；
Lens 16 have negative focal power, and the surface (central part) of object side L1 is concave, the surface (central part) of image side L2
Also concave；Lens 17 have positive focal power, and the surface (central part) of object side L1 is convex, the surface of image side L2
(central part) is also convex.In the present embodiment, lens 11 and lens 15 are made of glass, lens 12, lens 13, lens
14, lens 16 and lens 17 are formed from a resin, and the surface of the object side L1 of lens 15 and the surface of image side L2 are that spherical surface is (i.e. saturating
Mirror 15 is spherical lens), lens 16 and lens 17 are interconnected and become cemented lens, and however, it is not limited to this.
In addition, lens barrel 20 is, for example, the resin being molded.Extend along optical axis direction specifically, lens barrel 20 has
Cylindrical body part 21, from the front end (i.e. the end of object side L1) of the cylindrical body part 21 radially expanding collar flange in outside
Portion 22, the major diameter canister portion 23 extended from the neighboring of annular flange portion 22 towards front side (i.e. object side L1) and from tubular master
The neighbouring radially inside annular base plate portion 24 outstanding in the rear end (i.e. the end of image side L2) in body portion 21, also, in cylindrical body
Portion 21 is formed with circular step portion 25 than annular base plate portion 24 slightly by the position of front side, is formed in the front side of cylindrical body part 21
There is the annular recess 26 being recessed from the end face of its object side L1 towards image side L2.In the present embodiment, the image side L2 of lens 11
Surface abutted with the surface of cylindrical body part 21 and the object side L1 of annular flange portion 22, the object side L1's of major diameter canister portion 23
Radially inside is prominent and abutted from object side L1 with lens 11 for end (caulking part), thus in the direction of the optical axis to lens 11 into
Row positioning；The surface of the image side L2 of lens 16 is abutted with the surface of the object side L1 in circular step portion 25, is passing through circular step
The front side for the lens 16 that portion 25 positions overlaps with successively keeps the retainers 30 of lens 15, aperture 60, lens 14, lens 13 and thoroughly
Mirror 12, radially inside protrudes and is abutted from object side L1 with lens 12 for the end of the object side L1 of cylindrical body part 21, thereby,
Lens 12, lens 13, lens 14, lens 15 and lens 16 are positioned in the direction of the optical axis；Lens 17 are sandwiched in lens 16
Between annular base plate portion 24.Also, it in the present embodiment, is formed with from its object side L1 in the front side of annular flange portion 22
The annular recess 27 that is recessed towards image side L2 of end face, be provided with sealing ring 80 in the annular recess 27, the sealing ring 80 is right
It is sealed between lens 11 and annular flange portion 22；In lens barrel 20, infrared filter 70 is arranged in annular base plate portion 24
Between lens unit retainer 200, and it is held in the rear end face in annular base plate portion 24.
In addition, as shown in Figures 2 and 3, on the lens barrel 20 of lens unit 100, being formed on external screw thread 211 and lens
Unit retainer 200 internal thread contact multiple protrusions 212 (in the example in the figures, the shape, size of each protrusion are identical,
However, it is not limited to this, and shape, the size of each protrusion also can be different).
In addition, as shown in Figures 2 and 3, protrusion 212 is formed in the tooth bottom of the thread of external screw thread 211.Also, it is multiple convex
Portion 212 equidistantly is formed on external screw thread 211 (being formed by helix).
Also, in the present embodiment, multiple protrusions 212 be formed in the center line O of external screw thread 211 (herein with optical axis L
Overlapping) on parallel a plurality of (being four in the example in the figures, however, it is not limited to this) straight line, this plurality of straight line is with external screw thread
Equiangularly spacing is distributed centered on 211 center line O.
Also, in the present embodiment, external screw thread 211 is formed with multi-turn on optical axis L direction.
In addition, lens unit retainer 200 is, for example, the resin being molded.
Optical unit according to the present embodiment, by being formed and lens list on the external screw thread 211 of 20 peripheral surface of lens barrel
Multiple protrusions 212 of the internal thread contact of first retainer 200, are assembling lens unit 100 and lens unit retainer 200
Under state, help to increase external screw thread 211 and the lens unit retainer 200 of the lens barrel 20 of lens unit 100 internal thread it
Between contact area, to increase the frictional force that generates therebetween, and then increase relative to lens unit retainer 200
The screw thread torque generated when the lens barrel 20 for twisting lens unit 100, therefore, even if in 20 peripheral surface of lens barrel of lens unit 100
The major diameter of the external screw thread 211 of upper formation is too small or the path of internal thread that is formed on lens unit retainer 200 is excessive,
It is avoided that in the state of assembling lens unit 100 and lens unit retainer 200 and is twisted relative to lens unit retainer 200
The too small situation of the screw thread torque that is generated when the lens barrel 20 for turning lens unit 100, even if 20 peripheral surface of lens barrel of lens unit 100
External screw thread 211 and/or lens unit retainer 200 internal thread dimensional discrepancy it is larger, also can easily meet high-precision
Screw thread torque demand.
In addition, optical unit according to the present embodiment, protrusion 212 is formed in the tooth bottom of the thread of external screw thread 211, because
This is easy to form protrusion 212 using mold compared with the case where forming protrusion at the crest in externally threaded thread, and
And in the state of assembling lens unit 100 and lens unit retainer 200 it is easy to ensure that protrusion 212 on lens barrel 20 with
The contact area of internal thread on lens unit retainer 200.
In addition, optical unit according to the present embodiment, equidistantly has formed multiple protrusions 212 on external screw thread 211,
Therefore, it is twisted relative to lens unit retainer 200 in the state of assembling lens unit 100 and lens unit retainer 200
When turning the lens barrel 20 of lens unit 100, help to make that focus adjustment is steady, accurately carries out.
In addition, optical unit according to the present embodiment, 212 arrangement form of multiple protrusions is at the center with external screw thread 211
On straight line parallel line O, therefore, protrusion 212 can be easily formed on the peripheral surface of the lens barrel 20 of lens unit 100, helped
In reduction manufacturing cost.
In addition, optical unit according to the present embodiment, 212 arrangement form of multiple protrusions is at the center with external screw thread 211
On a plurality of straight line parallel line O, equiangularly spacing is distributed this plurality of straight line centered on the center line O of external screw thread 211, because
This, twists in the state of assembling lens unit 100 and lens unit retainer 200 relative to lens unit retainer 200
When the lens barrel 20 of lens unit 100, help to make that focus adjustment is steady, accurately carries out.
In addition, optical unit according to the present embodiment, external screw thread 211 is formed with multi-turn, therefore, is assembling lens list
In the state of member 100 and lens unit retainer 200, focus adjustment range can be increased.
In addition, optical unit according to the present embodiment, lens barrel 20 is the resin by being molded type, therefore,
Compared with by being machined to manufacture lens barrel the case where, help to reduce manufacturing cost.
The utility model is exemplarily described above in conjunction with attached drawing, it is clear that the specific implementation of the utility model is not
It is limited by the above embodiment.
For example, in the above-described embodiment, lens unit includes seven lens arranged along optical axis direction, but is not limited to
In this, the quantity of lens can be adjusted suitably as needed, also, the form of lens unit each lens for including also can be as needed
Appropriate adjustment.
In addition, in the above-described embodiment, capturing element is equipped on lens unit retainer 200, but do not limit to
In this, also capturing element can not be installed on lens unit retainer.
In addition, in the above-described embodiment, protrusion 212 is formed in the tooth bottom of the thread of external screw thread 211, but does not limit to
In this, protrusion also can be only formed in side or the crest of externally threaded thread, protrusion can be also formed simultaneously in external screw thread
Thread crest and side, protrusion can be also formed simultaneously to crest and the tooth bottom in externally threaded thread.
In addition, in the above-described embodiment, on the peripheral surface of the lens barrel 20 of lens unit 100, the shape on external screw thread 211
At there is multiple protrusions 212, however, it is not limited to this, as needed, also can only form a protrusion.
In addition, in the above-described embodiment, multiple protrusions 212 are formed in parallel with the center line O of external screw thread 211 a plurality of
On straight line, equiangularly spacing is distributed this plurality of straight line centered on the center line of external screw thread 211, and however, it is not limited to this, root
According to needs, multiple protrusions 212 can be also formed in on the straight line of the centerline parallel of external screw thread 211, alternatively, also can will
Multiple protrusions 212 are formed in other positions.
In addition, in the above-described embodiment, on the peripheral surface of the lens barrel 20 of lens unit 100, external screw thread 211 is formed with
Multi-turn, however, it is not limited to this, as needed, external screw thread can be also formed as to a circle or less.
In addition, in the above-described embodiment, lens barrel 20 and lens unit retainer 200 are the resins by being molded type
Product, however, it is not limited to this, and lens barrel and lens unit retainer can also be formed by other methods such as mechanical processings, also,
The material for constituting lens barrel and lens unit retainer is also not limited to resin material.
In addition, in the above-described embodiment, protrusion 212 for example can add molding after molding lens barrel 20 using mold
Go out.
Claims (9)
1. a kind of lens unit, has：
Lens；And
The lens are held in the lens barrel of inside,
The external screw thread with the internal screw-thread screw of lens unit retainer is formed on the peripheral surface of the lens barrel,
It is characterized in that,
At least one protrusion contacted with the internal thread of the lens unit retainer is formed on the external screw thread.
2. lens unit as described in claim 1, which is characterized in that
The protrusion is formed in the side of the externally threaded thread.
3. lens unit as described in claim 1, which is characterized in that
The protrusion is formed in the tooth bottom of the externally threaded thread.
4. lens unit as described in claim 1, which is characterized in that
Multiple protrusions equidistantly have been formed on the external screw thread.
5. lens unit as claimed in claim 4, which is characterized in that
Multiple protrusion arrangement forms on the straight line of the externally threaded centerline parallel.
6. lens unit as claimed in claim 4, which is characterized in that
Multiple protrusion arrangement forms on a plurality of straight line of the externally threaded centerline parallel,
Equiangularly spacing is distributed a plurality of straight line centered on the externally threaded center line.
7. such as lens unit according to any one of claims 1 to 6, which is characterized in that
The external screw thread is formed with multi-turn.
8. such as lens unit according to any one of claims 1 to 6, which is characterized in that
The lens barrel is the resin by being molded type.
9. a kind of optical unit, including：
Lens unit described in any item of the claim 1 to 8；And
Lens unit retainer, the lens unit retainer are formed with the internal thread with the external thread spiro fastening of the lens unit,
And capturing element is installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820468462.XU CN208026964U (en) | 2018-03-30 | 2018-03-30 | Lens unit and optical unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820468462.XU CN208026964U (en) | 2018-03-30 | 2018-03-30 | Lens unit and optical unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208026964U true CN208026964U (en) | 2018-10-30 |
Family
ID=63909107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820468462.XU Expired - Fee Related CN208026964U (en) | 2018-03-30 | 2018-03-30 | Lens unit and optical unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208026964U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110320628A (en) * | 2018-03-30 | 2019-10-11 | 日本电产三协（东莞）工机有限公司 | Lens unit and optical unit |
-
2018
- 2018-03-30 CN CN201820468462.XU patent/CN208026964U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110320628A (en) * | 2018-03-30 | 2019-10-11 | 日本电产三协（东莞）工机有限公司 | Lens unit and optical unit |
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Granted publication date: 20181030 |