CN1291395C - Optical reading/writing system - Google Patents
Optical reading/writing system Download PDFInfo
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- CN1291395C CN1291395C CNB2004100276893A CN200410027689A CN1291395C CN 1291395 C CN1291395 C CN 1291395C CN B2004100276893 A CNB2004100276893 A CN B2004100276893A CN 200410027689 A CN200410027689 A CN 200410027689A CN 1291395 C CN1291395 C CN 1291395C
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Abstract
The present invention relates to an optical reading /writing system which comprises a first light receiving and transmitting unit, a second light receiving and transmitting unit, a collimating lens, an objective and a composite prism, wherein the first light receiving and transmitting unit is provided with a first light source for transmitting a first incident light beam with a first wavelength; the second light receiving and transmitting unit is provided with a second light source for transmitting a second incident light beam with a second wavelength larger than the first wavelength; both the collimating lens and the objective have optical parameters corresponding to the first wavelength; the composite prism is arranged among the first light receiving and transmitting unit, the second light receiving and transmitting unit and the collimating lens, and is provided with a first part and a second part which are oppositely arranged; the first part is provided with a light input face and at least two reflecting faces; the second part is provided with a light output face and at least two reflecting faces; the light input face and light output face are arranged respectively and exactly facing the first incident light beam, the second incident light beam and the collimating lens; the first incident light beam and the second incident light beam are irradiated exactly facing the collimating lens after being reflected by a plurality of reflecting faces.
Description
[technical field]
The invention relates to a kind of optical disk recording/reproducing system, especially for the high-density optical read/write system of compatible different size CD.
[background technology]
The optical read/write system that uses in the data recording/reproducing device mainly utilizes the laser convergence of the specific wavelength that a series of optical modules send laser instrument to become a hot spot, and assembles to the CD to realize the read/write operation to CD.Along with the continuous evolution of CD specification from CD, DVD to HD-DVD, the information track of CD is made more fine and closely, and this just requires the hot spot of disk read/write information littler.And the size of hot spot is relevant with the numerical aperture (NA) of Wavelength of Laser and object lens, and the size of hot spot is proportional to Wavelength of Laser, is inversely proportional to the numerical aperture (NA) of object lens.So, the CD specification causes Wavelength of Laser constantly to reduce to highdensity evolution, and the numerical aperture of object lens (NA) constantly increases.Wavelength, numerical aperture (NA) are as shown in the table with the variation of CD specification:
| The CD specification | CD | DVD | HD-DVD |
| Wavelength | 780nm | 650nm | 405nm |
| Numerical aperture (NA) | 0.45 | 0.6 | 0.65 or 0.8 |
Because the optical parametric difference of different discs specification causes the compatibility issue of each specification to become outstanding.The optical disc information of read/write specific standard just must use the optical module that meets this kind CD specification, otherwise, can cause the possibility of read/write by mistake.Yet, desire to realize in a cover optical read/write device that at the corresponding optical read/write of each specifications design system, then obviously be not wise move to the read/write operation of plurality of specifications CD, it had both caused the read/write device volume excessive, make optical system become complicated again, cost increases.In the existing optical read/write device, as hybrid HD-DVD and dvd pickup read/write device, it has a HD-DVD laser instrument and a DVD laser instrument, send wavelength respectively and be about the blue light of 405nm and the ruddiness of 650nm, and be incident to behind separately the diffraction element by share optical module post-concentrations such as Amici prism, collimation lens, catoptron and object lens to the CD with read.This optical read/write device can reduce its volume to a certain extent by the shared portion optical module.Because collimation lens only can become directional light with the beam convergence that sends from its focal plane, that is, optical path distance is a fixed numeric values between laser instrument and the collimation lens.Be that this condition of fixed value is arranged at laser instrument on the focal plane of collimation lens for satisfying optical path distance in the existing optical read/write device.Yet laser instrument to the space length between the collimation lens just is the key factor that influences the optical read-write device volume, although the quantity of optical module reduces to some extent and but fails to shorten laser instrument to the space length between the collimation lens in the existing optical read/write device, so its degree of dwindling to the volume of optical read/write device is limited.
[summary of the invention]
Technical matters to be solved by this invention provides a kind of optical read/write system, is used for the data recording/reproducing device of recoding/reproduction different discs specification, and it can reduce the volume of optical read/write device.
The invention provides a kind of optical read/write system, comprise one first smooth Transmit-Receive Unit, one second smooth Transmit-Receive Unit, collimation lens, object lens and a composite prism.The first smooth Transmit-Receive Unit has first light source in order to first incident beam that sends first wavelength, and the second smooth Transmit-Receive Unit has a secondary light source in order to second incident beam that sends second wavelength, and this second wavelength is greater than first wavelength.Collimation lens and object lens all have and the corresponding optical parametric of first wavelength.Composite prism is located between first, second light Transmit-Receive Unit and the collimation lens, it has a first, a second portion, first, second part is oppositely arranged, and first has an incidence surface and at least two reflectings surface, and second portion has an exiting surface and at least two reflectings surface.Incidence surface and exiting surface are respectively over against first, second incident beam and collimation lens setting, and first, second incident beam reflects the back over against the collimation lens outgoing at described a plurality of reflectings surface.
Compared with prior art, the light path shared portion optical module of first, second incident beam in the optical read/write of the present invention system, thereby can reduce the required optical module number of optical read/write system, simultaneously, prism unit of sharing and composite prism are under the constant situation of the total optical path that guarantees light path, shorten the space length between first, second light Transmit-Receive Unit and the collimation lens, thereby can dwindle the device volume of this optical read/write system of use effectively.
[description of drawings]
Fig. 1 is an optical read/write system schematic of the present invention.
Fig. 2 is the prism unit vertical view of Fig. 1 optical read/write system.
Fig. 3 is the composite prism front view of Fig. 1 optical read/write system.
Fig. 4 is that the wavelength of Fig. 1 optical read/write system is selected the sheet vertical view.
Fig. 5 is that Fig. 4 wavelength selects sheet V-V to cut-open view.
[embodiment]
See also Fig. 1, it is the synoptic diagram of optical read/write of the present invention system 100.Optical read/write of the present invention system 100 is applicable in the data recording/reproducing device of recoding/reproduction different discs specification that present embodiment is an example with the optical read/write system that is applicable to the HD-DVD data recording/reproducing device.Optical read/write system 100 comprises one first smooth Transmit-Receive Unit 11, one second smooth Transmit-Receive Unit 12, one first diffraction elements 21, one second diffraction element, 22, one prism unit 3, one composite prism 4, one collimation lens, 5, one catoptrons, 6, one wavelength are selected sheet 7 and object lens 8.
These first, second light Transmit-Receive Unit 11,12 parallel being set up in parallel.The first smooth Transmit-Receive Unit 11 has one first light source (not indicating), one first detecting device (not indicating).First light source sends first incident beam, and this first incident beam has first wavelength.First detecting device detects first folded light beam of returning from CD.The second smooth Transmit-Receive Unit 12 comprises a secondary light source (not indicating), one second detecting device (not indicating).Secondary light source sends second incident beam, and this second incident beam has second wavelength.Second detecting device detects second folded light beam of returning from CD.First, second wavelength is respectively the blue light of read/writable HD-DVD specification CD that wavelength is 405nm and the ruddiness of the read/writable DVD specification CD that wavelength is 650nm in the present embodiment.
This first diffraction element 21, second diffraction element 22 are provided with over against first, second light source of first, second light Transmit-Receive Unit 11,12 respectively.
See also Fig. 2, it is the vertical view of the prism unit 3 of optical read/write of the present invention system 100.Described prism unit 3 comprises one first prism 31, one second prism 32, a prism 33, and first, second prism 31,32 is positioned at prism 33 phase the same sides.First, second, third prism 31,32,33 is the quadrangular structure.First prism 31 has parallelogram section, and promptly first incidence surface 310 of first prism 31 is parallel with first exiting surface 311, and 2 first reflectings surface 312,313 are parallel to each other.First reflecting surface 312 and first incidence surface 310 are in angle of 45 degrees.Second prism 32 has one second incidence surface 320 and one second exiting surface 321, and this second exiting surface 321 is a non-spherical structure, proofreaies and correct the spherical aberration that the DVD light path produces.The 3rd incidence surface 330 of prism 33 is parallel with the 3rd exiting surface 331, one end of prism 33 has the one and the 3rd incidence surface the 3rd reflecting surface 332 in angle of 45 degrees, the other end has a light path translation interface 333 parallel with the 3rd reflecting surface 332, and its incident light at different wave length has different reflections or transmission function.
See also Fig. 3, it is the front view of composite prism 4 of the present invention.This composite prism 4 comprises first, second part 41,42.This first 41 is prisms of identical material with second portion 42.This first 41 has quadrangular section, and it comprises that one the 4th incidence surface 410, one the 4th reflecting surface 411, one the 5th reflecting surface 412, lack limit 413.This second portion 42 also has quadrangular section, and it comprises that one the 4th exiting surface 420, one the 6th reflecting surface 421, one the 7th reflecting surface 422, lack limit 423.The 4th incidence surface 410 is parallel with the 4th exiting surface 420.First, second part 41,42 combines with the 4th reflecting surface 411, the 6th reflecting surface 421, the 4th reflecting surface 411, the 6th reflecting surface 421 only are coated with reflectance coating in its subregion respectively, with so that be incident to the beam reflection of coating film area, and make and be incident to the not light beam transmission of coating film area.Lack limit the 413, the 423rd, for the use of economical with materials forms after a jiao of first, second part 41,42 is clipped the part material, and institute clips part and is transmitted as limit not influence composite prism 4 inner light paths.This composite prism 4 is located between first, second light Transmit-Receive Unit 11,12 and the collimation lens 5, and is located in the common optical pathways of first, second incident beam.The basic parameter of described composite prism 4 is: a=4mm, b=4.828mm, =45 degree, θ=112.5 degree, β=67.5 degree.
Collimation lens 5 is provided with over against the 4th exiting surface 420 of composite prism 4.This collimation lens 5 is first incident beam designs of the shorter wavelength that adopted at the HD-DVD specification, it can convert first incident beam of first wavelength to parallel beam, and second incident beam of second wavelength that the specification of DVD shown in the present embodiment is adopted converts approximate directional light to.
Object lens 8 have non-spherical structure over against the CD setting, and it also is wavelength, numerical aperture (NA) design of being adopted at the HD-DVD specification.
Please consult Fig. 4 and Fig. 5 simultaneously.Wavelength selects sheet 7 between object lens 8 and catoptron 6, wavelength selects sheet 7 to have interior regional A of circle and outer region B, the light beam that the first short wavelength of the regional A tolerable of interior circle reaches than the second long wavelength passes through, and outer region B only allows that the light beam of the first short wavelength passes through.
Please consult Fig. 1 once more, during read/write HD-DVD CD, first light source of the first smooth Transmit-Receive Unit 11 first incident beam by of first incidence surface 310 incidents of first diffraction element 21 back from first prism 31, and in first reflecting surface 312,313 two secondary reflections take place.Because it is first reflecting surface 312,313 is parallel to each other, therefore, consistent with incident direction from first incident beam of first incidence surface, 310 incidents from the exit direction of first incident beam of first exiting surface, 311 outgoing.First incident beam after the outgoing is incident to light path translation interface 333 from the 3rd incidence surface 330 of prism 33.Because light path translation interface 333 is designed to the first incident beam transmission to first wavelength, and second incident beam of second wavelength is reflected, so first incident beam is from 333 transmissions of light path translation interface, then from 331 outgoing of the 3rd exiting surface.
Be incident to the 4th reflecting surface 411 from first incident beam of prism 33 outgoing via the 4th incidence surface 410 of composite mirrors 4.Because the 4th reflecting surface 411 parts are coated with reflectance coating, thereby first incident beam that is incident to the 4th reflecting surface 411 is by first reflection.The 5th reflecting surface 412 that is coated with reflectance coating through first incident beam behind the first reflection reflects the place that combines that the back arrives the 4th reflecting surface 411, the 6th reflecting surface 421 for the second time.At this moment, owing to the 4th reflecting surface 411, the 6th reflecting surface 421 only partly are coated with reflectance coating and can intercept first incident beam that is reflected for the second time.Thereby first incident beam does not plate the reflectance coating zone from the 4th reflecting surface 411 and is transmitted through the 4th exiting surface 420.
Total reflection principle according to light, when light transfers to optically thinner medium from optically denser medium, if incident angle is more than or equal to cirtical angle of total reflection C, then incident light is in the interface generation total reflection of two media and can not transmit optically denser medium, otherwise, if incident angle is less than cirtical angle of total reflection C, then incident light will transmit optically denser medium and enter optically thinner medium.Therefore, total reflection (i.e. reflection for the third time) takes place in the 4th exiting surface 420 in first incident beam.Cirtical angle of total reflection C can calculate according to formula C=arcsin (l/n) and obtain, and n is the refractive index of optically denser medium in the formula.The optically denser medium of present embodiment is a composite prism, its refractive index is n, according to above-mentioned formula and make incident angle I that first incident beam is transmitted through the 4th exiting surface 420 from the 4th reflecting surface 411, thereby can make first incident beam in 420 total reflections of the 4th exiting surface and not transmission is gone out greater than angle of total reflection C.First incident beam after the total reflection after the 4th secondary reflection takes place in the 7th reflecting surface 422 that is coated with reflectance coating, at the 6th reflecting surface 421 by the 5th secondary reflection.Be incident to the 4th exiting surface 420 at the 6th reflecting surface 421 once more by first incident beam of the 5th secondary reflection, thus since this moment incident angle be able to from 420 outgoing of the 4th exiting surface to collimation lens 5 less than first incident beam that angle of total reflection C is incident to the 4th exiting surface 420 once more.
Be collimated into parallel beam from first incident beam of the 4th exiting surface 420 outgoing by collimation lens 5 at first incident beam design with first wavelength.Reflex to wavelength through catoptron 6 and select sheet 7.Regional A of circle and outer region B in wavelength selection sheet 7 has, the light beam that the first short wavelength of the regional A tolerable of interior circle reaches the second long wavelength passes through, and outer region B only allows that the light beam of the first short wavelength passes through.First incident beam after catoptron 6 reflections is all selected sheet 7 by wavelength, and is converged to a hot spot (not indicate) read from the HD-DVD CD by object lens 8.Return via object lens 7 from first folded light beam of optical disc surface reflection, it returns light path and input path is basic identical.Difference is that first folded light beam is reflected by this first diffraction element 21 through first diffraction element, 21 backs, first folded light beam after the refraction is projected to first detecting device (figure does not show) on the first smooth Transmit-Receive Unit 11, and this first detecting device converts light signal to electric signal and exports interlock circuit to.
Because the optical parametric of the various optical modules that comprise in the light path of first incident beam and first folded light beam all with reference to the HD-DVD specifications design, the aberration that causes owing to collimation lens, object lens can not occur.Simultaneously, prism unit 3 and composite prism 4 shorten the space length between light Transmit-Receive Unit 11 and the collimation lens 5 under the constant situation of the total optical path that guarantees light path, thereby dwindle the volume of the device of this optical read/write system 100 of use effectively.
During read/write DVD CD, second incident beam that secondary light source sent of the second smooth Transmit-Receive Unit 12 passes through second incidence surface 320 incidents of second diffraction element, 22 backs from second prism 32, and is had second exiting surface 321 convergence for the first time of non-spherical structure.Through three incidence surface 330 incidents of second incident beam after assembling for the first time, and reflex to light path translation interface 333 in the 3rd reflecting surface 332 of prism 33 from prism 33.Light path translation interface 333 has selectivity, and it is to having the first incident beam transmission of first wavelength (as 405nm), and to having second incident beam reflection of second wavelength (as 650nm).Simultaneously because the 3rd reflecting surface 332 is parallel with light path translation interface 333, thereby second folded light beam through two secondary reflections after its from the direction of the 3rd exiting surface 331 outgoing with consistent from the direction of the 3rd incidence surface 330 incidents.
Through for the first time can coalescence second incident beam after prism 33 outgoing with the light path similar to first incident beam by composite prism 4, be incident to collimation lens 5 then.Because the optical parametric of collimation lens 5 is first incident beam designs of lacking (first wavelength) at wavelength, so it only can be converged to approximate parallel beam for the second time with second incident beam.This approximately parallel second incident beam reflexes to wavelength via catoptron 6 and selects sheet 7, because the regional A of circle allows that the incident beam of shorter wavelength and longer wavelength (second wavelength) passes through within the wavelength selection sheet 7, outer region B only allows that the incident beam of shorter wavelength (first wavelength) passes through.Thereby second incident beam only can pass through from the regional A of interior circle, and the outer peripheral portion light beam of second incident beam is intercepted by outer region B and can not pass through.Second incident beam that passes through from the regional A of interior circle satisfy the DVD specification than small value aperture, it is incident to object lens 8 and is converged to hot spot read from the DVD CD for the third time by object lens 8.Return via object lens 8 from second folded light beam of DVD optical disc surface reflection, it returns light path and input path is basic identical.Difference is that second folded light beam is reflected by this second diffraction element 21 through second diffraction element, 21 backs, second folded light beam after the refraction is projected to second detecting device (figure does not show) on the second smooth Transmit-Receive Unit 12, and this second detecting device converts light signal to electric signal and exports interlock circuit to.
Although the optical parametric of shared portion optical module is all with reference to the HD-DVD specifications design in the light path of second incident beam and first incident beam, yet second incident beam is assembled for 8 three times via second prism 32, collimation lens 5 and object lens, and utilize wavelength to select sheet 7, thereby can effectively eliminate the aberration that does not match and caused owing to collimation lens, object lens so that second incident beam satisfies the numerical aperture of DVD specification.Simultaneously, utilize prism unit 3 and composite prism 4 under the constant situation of the total optical path that guarantees light path, shorten the space length between light Transmit-Receive Unit 11 and the collimation lens 5, and then dwindle the volume of the device of this optical read/write system 100 of use effectively.
Claims (10)
1. optical read/write system, it comprises one first smooth Transmit-Receive Unit, one second smooth Transmit-Receive Unit, collimation lens, object lens and a composite prism, this first smooth Transmit-Receive Unit has first light source in order to first incident beam that sends first wavelength; This second smooth Transmit-Receive Unit has a secondary light source in order to second incident beam that sends second wavelength, and this second wavelength is greater than first wavelength; This collimation lens and object lens all have and the corresponding optical parametric of first wavelength; This composite prism has a first, one second portion, this is first years old, second portion is oppositely arranged, first has quadrangular section, it comprises one the 4th incidence surface, one the 4th reflecting surface and one the 5th reflecting surface, this second portion has quadrangular section, it comprises one the 4th exiting surface, one the 6th reflecting surface and one the 7th reflecting surface, the 4th incidence surface of first is parallel with the 4th exiting surface of second portion, first and second portion combine with the 6th reflecting surface of second portion by the 4th reflecting surface of first, the 4th reflecting surface, the 6th reflecting surface only is coated with reflectance coating in its subregion respectively, with so that be incident to the beam reflection of coating film area, and make and be incident to the not light beam transmission of coating film area, it is characterized in that: described composite prism is located at first, between the second smooth Transmit-Receive Unit and the collimation lens, and this incidence surface and exiting surface are respectively over against first, second incident beam and collimation lens setting, first, second incident beam reflects the back over against the collimation lens outgoing at described a plurality of reflectings surface; This optical read/write system further comprises a prism unit, this prism unit comprises one second prism, this second prism is arranged between the second smooth Transmit-Receive Unit and the composite prism, this second prism has one second incidence surface and one second exiting surface, this second exiting surface is a non-spherical structure, and this second prism is used to transmit second incident beam.
2. optical read/write according to claim 1 system, it is characterized in that: the 4th incidence surface of this first and the 4th reflecting surface are in angle of 45 degrees, and become 112.5 degree angles with the 5th reflecting surface, first, second incident beam reflects at the 4th reflecting surface after the 4th incidence surface incident, and the light beam after the reflection reflection takes place and export second portion at the 5th reflecting surface.
3. optical read/write according to claim 1 system, it is characterized in that: the 6th reflecting surface of this second portion and the 4th exiting surface are in angle of 45 degrees, and become 67.5 degree angles with the 7th reflecting surface, first, second incident beam is transmitted through the 4th exiting surface and total reflection takes place, and the light beam after the total reflection successively exports collimation lens in the 7th, the 6th reflecting surface reflection back to from the 4th exiting surface.
4. optical read/write according to claim 1 system, it is characterized in that: the 4th incidence surface is parallel to the 4th exiting surface so that first, second incident beam from the direction of the 4th incidence surface incident with identical from the direction of the 4th exiting surface outgoing.
5. optical read/write according to claim 2 system, it is characterized in that: the 5th reflecting surface is coated with reflectance coating.
6. optical read/write according to claim 3 system, it is characterized in that: the 7th reflecting surface is coated with reflectance coating.
7. optical read/write according to claim 1 system, it is characterized in that: this prism unit further comprises one first prism and a prism, first prism is arranged in the light path of first incident beam, prism is arranged in the common light path of first, second incident beam, this first prism transmits first incident beam, and exporting it to prism, this prism will be exported by same position from first, second incident beam of different light paths.
8. optical read/write according to claim 7 system is characterized in that: the prism of this prism unit further comprises one for the first incident beam transmission and for the light path translation interface of second incident beam reflection.
9. optical read/write according to claim 1 system, it is characterized in that: these object lens have non-spherical structure.
10. optical read/write according to claim 1 system is characterized in that: sheet is selected in a wavelength is set near the object lens place by this optical read/write system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100276893A CN1291395C (en) | 2004-06-12 | 2004-06-12 | Optical reading/writing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100276893A CN1291395C (en) | 2004-06-12 | 2004-06-12 | Optical reading/writing system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1707652A CN1707652A (en) | 2005-12-14 |
| CN1291395C true CN1291395C (en) | 2006-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100276893A Expired - Fee Related CN1291395C (en) | 2004-06-12 | 2004-06-12 | Optical reading/writing system |
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| CN (1) | CN1291395C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114613252B (en) * | 2020-12-09 | 2023-12-01 | 成都极米科技股份有限公司 | Optical system and display device |
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