CN109839786B

CN109839786B - Lens and method for manufacturing same

Info

Publication number: CN109839786B
Application number: CN201711230975.3A
Authority: CN
Inventors: 陈文洲; 黄友廷; 陈昭舜
Original assignee: Young Optics Inc
Current assignee: Young Optics Inc
Priority date: 2017-11-29
Filing date: 2017-11-29
Publication date: 2022-11-11
Anticipated expiration: 2037-11-29
Also published as: CN109839786A

Abstract

A lens comprises a lens barrel, a lens group, a photo interrupter, a shading sheet and a power machine. The lens group is arranged in the lens barrel, the optical interrupter is arranged in the lens barrel and is provided with an optical transmitter and an optical receiver, the optical transmitter can emit light beams along a first direction, and the optical receiver can receive the light beams. The shading sheet is arranged on the traveling light path of the light beam and is provided with two shading parts with different lengths. The power machine is connected with the moving parts, and the moving parts are connected to the mirror group.

Description

Lens and manufacturing method thereof

Technical Field

The invention relates to a lens and a lens manufacturing method.

Background

The use of a camera with a zoom lens to enable a user to adjust the focal length according to his/her own needs is now quite popular. As shown in fig. 1, a photo interrupter 102 may be disposed in the zoom lens 100, and when the photo interrupter 102 of the zoom lens 100 passes through the fin-shaped light shielding portion 104, the current flowing to the photo transistor is changed, so that the change of the light shielding state and the light propagation state can be detected to confirm the position of the movable lens group in the zoom lens. However, in the above design, when the zoom lens is started each time, the lens motor needs to drive the photo interrupter 102 to the starting point position, and then the number of motor steps can be adjusted, but this method is prone to increase the risk of motor step loss or bumping due to errors such as backlash or optical detection.

Disclosure of Invention

Other objects and advantages of the present invention will be further understood from the technical features disclosed in the embodiments of the present invention.

An embodiment of the invention provides a lens, which includes a lens barrel, a first lens group, a photo interrupter, a light shielding sheet, and a power unit. The first lens group is arranged in the lens cone, the light interrupter is arranged in the lens cone and is provided with a light emitter and a light receiver, the light emitter can emit light beams according to a first direction, and the light receiver can receive the light beams. The shading sheet is arranged on the traveling light path of the light beam and is provided with two shading parts with different lengths. The power machine is connected with the moving machine part, and the moving machine part is connected to the first mirror group.

An embodiment of the invention provides a lens, which includes a lens barrel, a first lens group, a waveform generator, a processor, and a power machine. The first lens group is arranged in the lens cone, the waveform generator can generate a first pulse signal and a second pulse signal, and the pulse width of the second pulse signal is smaller than that of the first pulse signal. And the processor is electrically connected with the waveform generator and receives the first pulse signal and the second pulse signal of the waveform generator so as to confirm the current position of the first mirror group. The power machine is connected with the moving parts, and the moving parts are connected to the first mirror group.

By means of the design of the embodiment of the invention, two shading parts with different lengths are formed on the component, so that a corresponding shading state and a light propagation state can be formed, and different light shading time of the light shading device can be provided, therefore, a focusing starting point, each relative position or focusing range when the mirror group moves can be accurately known by a pulse signal of the light shading device, the condition of focusing abnormality or collision caused by motor desynchronization is avoided, and the configuration mode of the shading parts can be changed according to the requirement of a user so as to adjust the positioning accuracy, the focusing range or the stroke range of a moving part.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

Fig. 1 shows a schematic diagram of a conventional zoom lens design.

Fig. 2 is a schematic view illustrating a lens barrel according to an embodiment of the invention.

Fig. 3 is a block diagram illustrating the lens structure of fig. 2.

Fig. 4 shows a schematic view of a light shielding sheet according to an embodiment of the invention.

FIG. 5 is a schematic diagram of pulse signals with different widths according to an embodiment of the invention.

Fig. 6 shows a schematic view of a light shielding sheet according to another embodiment of the invention.

Detailed Description

The foregoing and other technical and scientific aspects, features and advantages of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are referred to only in the direction of the attached drawings. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting.

FIG. 2 is a schematic view of a lens according to an embodiment of the invention. As shown in fig. 2, a lens 10 includes a lens barrel 11, a photo interrupter 12, a light shielding sheet 14, a lens group 16, a power unit 17, and a moving mechanism 18. The mirror group 16 is disposed in the lens barrel 11, the power machine 17 is connected to the moving mechanism 18, and the moving mechanism 18 is connected to the mirror group 16. The mirror group 16 may be, for example, a zoom (focusing) mirror group or a focus (focusing) mirror group, but is not limited thereto. The moving mechanism 18 can be directly connected or indirectly connected to the mirror group 16 through other components, and the power machine 17 can drive the mirror group 16 by using a mechanism linkage or a magnetic driving manner, but is not limited to. The movement may be driven by, for example, a step motor as the power machine 17, one end of the mirror group 16 is connected to a connecting member such as a clamp (clip), a moving member 18 such as a screw is clamped on the screw by the clamp, and the step motor rotates the screw to drive the mirror group 16 to move. The connecting member means a member for connecting two or more members, such as a holder, a bolt, a pin, a key, a rivet, etc. The moving parts are used for transmitting 'energy (power)' or changing the direction of force, such as screws, friction wheels, gears, cams, belt wheels, rope wheels, chain wheels, shaft couplings, shafts, belts, rope rings, chains and the like. The magnetic driving method can be, for example, when the power machine is a Voice Coil Motor (VCM), the mirror group is driven by controlling the stretching position of the spring plate by changing the dc current of the coil in the motor in a permanent magnetic field (which can be a magnet or other magnetic material, such as a magnetic alloy sheet or steel sheet). The light shield 14 is provided on the traveling optical path of the light beam emitted from the photo interrupter 12, and has two

light shield portions

14a and 14b having different lengths. In the present embodiment, the light shielding sheet 14 is, for example, a sheet-shaped member having a plurality of openings 142. The light-shielding portion 14a having a long length is formed at a position where the opening 142 is not provided, and the light-shielding portion 14b having a short length is formed at a position where the opening 142 is provided. Referring to fig. 3, in the present embodiment, the light emitter 12a of the photo interrupter 12 can emit the light beam I in a direction, and the light receiver 12b receives the light beam I after being reflected by the light shielding sheet 14. The light beam I can be configured to be in a light-shielded state by passing through the light-shielding portion 14a having a long length, and the light beam I can be configured to be in a light-propagating state by passing through the light-shielding portion 14a having a short length. The photo interrupter 12 emits a signal S after receiving the light beam I, wherein the signal S may include a normal signal V and a delayed signal V' corresponding to a light shielding state and a light propagation state. The processor 15 is electrically connected to the photo interrupter 12 and receives the signal S to determine the current position of the mirror group 16. Furthermore, the processor 15 can receive the start command CT to determine the moving direction of the mirror group 16, and issue the control command CO according to the start command CT. The power driver 19 is electrically connected to the power 17 and the processor 15, the power driver 19 receives the control command CO from the processor 15 to send out the second signal T, and the power 17 receives the second signal T from the power driver 19 to drive the mirror group 16 to move by the moving part 18.

FIG. 4 is a schematic view of a light shielding sheet according to an embodiment of the invention. In the present embodiment, the light shielding sheet 14 is, for example, a sheet member 141 provided with a plurality of openings 142. The two light-shielding

portions

14a and 14b having different lengths can be formed by the presence or absence of the opening 142, and in this embodiment, the length can be a light-shielding length in a direction P substantially perpendicular to a tangential direction of movement of the light-shielding sheet 14. The plurality of openings 142 may include, for example, a first opening 142a, a plurality of second openings 142b and a third opening 142c, and the plurality of second openings 142b are disposed between the first opening 142a and the third opening 142 c. In the present embodiment, the first opening 142a and the third opening 142c located at the outermost edge are different from the plurality of second openings 142b in type, and the first opening 142a and the third opening 142c may have the same type, for example. For example, the first and third openings 142a and 142C may have the same larger size, and the second opening 142B may have a smaller size, so that when the shutter 14 moves relative to the photo interrupter 12, when the first opening 142a or the third opening 142C having the larger size passes through the photo interrupter 12, a pulse signal a or a pulse signal C having a larger pulse width as shown in fig. 5 is generated due to a larger current flowing to the photo transistor, and when the second openings 142B having the smaller size pass through the photo interrupter 12, a plurality of pulse signals B having a smaller pulse width as shown in fig. 5 are generated due to a smaller current flowing to the photo transistor, so that the shutter 14 can provide different light-blocking times of the photo interrupter 12, and the photo interrupter 12 can serve as a waveform generator that can generate pulse signals having different widths. The "pulse signal" represents a voltage or current signal with a sudden change in time, a very short action time, and a characteristic interval, and the pulse width is the duration of a high level in the signal. In one embodiment, the first opening 142a may correspond to a focus start position of the lens 10, so that the lens 10 and the light shielding film 14 disposed thereon can be quickly known to be located at the start position by recognizing the pulse signal a corresponding to the first opening 142 a. Furthermore, the plurality of pulse signals B may respectively correspond to a plurality of relative movement positions of the mirror group 16, so that by identifying the plurality of pulse signals B having different forms from the pulse signal a, the position of the mirror group 16 relative to the starting point at present can be known, and the distance or the size of the two adjacent second openings 142B can be adjusted according to the requirement to improve the sensing accuracy. In the present embodiment, the

light shielding portions

14a and 14b are arranged at the same pitch, but not limited thereto. In addition, in the embodiment, the first opening 142a and the third opening 142C may correspond to two end points (start and end points) of the adjustable focus range, respectively, so that the adjustable focus range of the lens 10 can be defined by detecting the pulse signal a and the pulse signal C corresponding to the first opening 142a and the third opening 142C in the detection signal.

By means of the design of the above embodiment, two light-shielding parts with different lengths are formed on the member, so that the corresponding light-shielding state and light propagation state can be formed, and different light-shielding time of the light-shielding device can be provided, so that the focusing starting point, each relative position when the mirror group moves or the focusing range can be accurately known by the pulse signal of the light-shielding device, the focusing malfunction or crash caused by the desynchronization of the motor can be avoided, and the configuration mode of the light-shielding parts can be changed according to the requirement of a user, so as to adjust the positioning precision, the focusing range or the stroke range of the moving parts.

FIG. 6 is a schematic diagram of another embodiment of the present invention. As shown in fig. 6, the light-shielding sheet 24 includes a sheet member 241 and a plurality of inserts 243. In the present embodiment, the light shielding portion 14a having a long length is formed at the position where the insert 243 is provided, and the light shielding portion 14b having a short length is formed at the position where the insert 243 is not provided, and the light beam can be in the light shielding state by passing through the light shielding portion 14a having a long length, and the light beam can be in the light transmitting state by passing through the light shielding portion 14a having a short length. Since the insert 243 is easily attached to and detached from the sheet member 241, the size or pitch of the

light shielding portions

14a and 14b and the light blocking time of the photo interrupter 22 can be easily adjusted.

It should be noted that the shape of the light shielding sheet 14 is not limited at all, and in an embodiment, for example, the light shielding sheet may have an arc shape corresponding to the outer circumference of the lens barrel 11, and the rotation angle range of the light shielding sheet 14 or the adjustable focus range of the lens 10 may be any angle range of 0-360 degrees.

In one embodiment, the light shielding sheet 14 may be made of, but not limited to, metal or plastic. In one embodiment, the light shielding sheet 14 may be a single multi-hole sheet metal part or a combination of multiple sheet metal parts. In one embodiment, the photo interrupter 12 is kept fixed and the light shielding plate 14 is linked with the mirror group 16, or the light shielding plate 14 can be kept fixed and the photo interrupter 12 is linked with the mirror group 16. In one embodiment, the motor 17 can be, for example, a stepping motor, a piezoelectric motor, or a voice coil motor, and the moving member 18 can be, for example, but not limited to, a screw, a friction wheel, a gear, a cam, a pulley, a sheave, a sprocket, a coupling, a shaft, a belt, a loop, or a chain.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A lens barrel, comprising:

a lens barrel;

the first lens group is arranged in the lens cone;

the photointerrupter is arranged at a fixed position of the lens barrel and is provided with a light emitter and a light receiver, the light emitter can emit light beams along a first direction, and the light receiver can receive the light beams;

a movable light shielding sheet arranged on a traveling light path of the light beam, the movable light shielding sheet including a first opening, a plurality of second openings and a third opening, the plurality of second openings being arranged between the first opening and the third opening, the plurality of second openings having sizes smaller than the first opening and the third opening, respectively, the photointerrupter being fixed and the light shielding sheet being interlocked with the first mirror group; and

and the power machine is connected with the moving machine part, and the moving machine part is connected to the first mirror group.

2. The lens barrel as claimed in claim 1, further comprising a processor electrically connected to the photo interrupter, wherein the photo interrupter is used to send a first signal after receiving the beam, and the processor receives the first signal to determine the current position of the first lens group.

3. The lens barrel as claimed in claim 2, wherein the processor receives a start command for determining the moving direction of the first lens group.

4. The lens barrel as claimed in claim 2, further comprising:

and the power machine driver is electrically connected with the power machine, can receive the control command of the processor to send out a second signal, can receive the second signal sent by the power machine driver, and is used for driving the first mirror group to move by virtue of the moving machine part.

5. The lens barrel as claimed in claim 2, wherein the power machine is a stepping motor, a piezoelectric motor or a voice coil motor.

6. The lens barrel as claimed in claim 2, wherein the moving member is a screw, a friction wheel, a gear, a cam, a pulley, a sheave, a sprocket, a coupling, a shaft, a belt, a loop, or a chain.

7. A lens barrel, comprising:

a lens barrel;

the first lens group is arranged in the lens cone;

the waveform generator is arranged at a fixed position of the lens cone and can generate a first pulse signal and a second pulse signal, the pulse width of the second pulse signal is smaller than that of the first pulse signal, and the first pulse signal is used for corresponding to the end point of the focus-adjustable range;

the processor is electrically connected with the waveform generator and receives the first pulse signal and the second pulse signal of the waveform generator to confirm the current position of the first mirror group; and

the power machine is used for driving the first mirror group.

8. The lens barrel as claimed in claim 7, wherein the processor receives a start command for determining the moving direction of the first lens group.

9. The lens barrel as claimed in claim 7, further comprising:

and the power machine driver is electrically connected with the power machine, can receive the control command of the processor to send out a second signal, can receive the second signal sent by the power machine driver, and is used for driving the first mirror group to move through a moving part.

10. The lens barrel as claimed in claim 9, wherein the moving member is a screw, a friction wheel, a gear, a cam, a pulley, a sheave, a sprocket, a coupling, a shaft, a belt, a loop, or a chain.

11. The lens barrel as claimed in claim 7, wherein the power machine is a stepping motor, a piezoelectric motor or a voice coil motor.