CN100454409C - Optical read / write device - Google Patents
Optical read / write device Download PDFInfo
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- CN100454409C CN100454409C CNB2004100265193A CN200410026519A CN100454409C CN 100454409 C CN100454409 C CN 100454409C CN B2004100265193 A CNB2004100265193 A CN B2004100265193A CN 200410026519 A CN200410026519 A CN 200410026519A CN 100454409 C CN100454409 C CN 100454409C
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- type prism
- write device
- optical read
- reflection
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Abstract
The present invention relates to an optical reading / writing device which mainly comprises a light receiving and transmitting unit, a collimating lens, a polyhedral reflection type prism, a light path switching component for changing the transmission direction of light beams, and an objective, wherein the reflection type prism is provided with a light input face and a light output face which form a certain angle; the light receiving and transmitting unit is positioned in the position opposite to the light input face of the polyhedral reflection type prism, and is provided with a light transmitting device for transmitting a light signal inputting to the surface of an optical disc and a light detecting device for receiving a light signal returning from the surface of an optical disc; the collimating lens is arranged oppositely to the light output face of the polyhedral reflection type prism so as to convert input divergent light beams into parallel light beams or convert the parallel light beams into convergent light beams; a light signal vertically irradiated to the light input face of the polyhedral reflection type prism is vertically irradiated from the light output face of the polyhedral reflection type prism after being reflected among the surfaces of the polyhedral reflection type prism.
Description
[technical field]
The present invention relates to a kind of optical data recording/reproducing device, especially relates to a kind of optical read/write device that is used for this optical data recording/reproducing device.
[background technology]
As record/read the carrier of information, it has characteristics such as the data storing capacity is big to optic recording/reproducing device, now extensively applies to each field such as people's work, life with light signal.Along with people to the improving constantly of consumption electronic products personalization, portability demand, people propose requirements at the higher level to optical recording/reproducing technology field.Optic recording/reproducing device not only is a family expenses formula product, and to become portable portable product, satisfying people by bus, use in the action environment such as walking, travelling, thereby how to realize that the optic recording/reproducing device miniaturization has become research staff's subject matter to be solved in this field.
As record/read the carrier of information, thereby optical read/write head is its primary core component to optic recording/reproducing device with light signal.It is arranged at the CD below, and can move so that light beam accurately falls into the target location of CD along disc radial direction.See also Fig. 1, existing optical read/write device 1 generally includes a laser instrument 10, collimation lens 12, a reflection subassembly 13 and object lens 14.Wherein, the optical axis of laser instrument 10, collimation lens 12 is all X-axis.The optical axis of object lens 14 is the Z axle, and the optical axis of reflection subassembly 13 and X-axis or Z between centers are in angle of 45 degrees.Laser instrument 10 sends a light beam and inputs to collimation lens 12 collimation lenses 12 it is changed into parallel beam, inputs to object lens 14 by the reflection subassembly 13 that is obliquely installed, thereby is focused on the CD.This technical scheme needs laser instrument 10 is located at the focal position of collimation lens 12, and the focal length of collimation lens 12 is subjected to the qualification of factors such as lens thickness, numerical aperture, it needs more than tens millimeters usually, after this optical read/write head encapsulation, the size of X-direction can be far longer than the size of Y direction.So optic recording/reproducing device is located at CD radially with the X-direction of optical read/write head usually, Y-axis is located at the tangential of CD.Optical read/write head need accurately read or the most inboard extremely outermost data of recording disk, in order to arrive end positions, the optic recording/reproducing device need are radially reserved enough activity spaces to optical read/write head CD, and optical read/write head X-axis length directly determines the activity space that it is required.Longer as its X-axis, the length of this activity space is just big, and this activity space is arranged on a side of the movement of optic recording/reproducing device, thereby its X-axis length can directly influence the overall dimensions of movement, and then influences the size of optical data recording/reproducing device.
[summary of the invention]
Technical matters to be solved of the present invention provides a kind of optical read/write device of realizing the optical data recording/reproducing device miniaturization.
The invention provides a kind of optical read/write device, it mainly comprises a smooth Transmit-Receive Unit, one collimation lens, one multiaspect reflection-type prism, one light path transition components is to change the transmission direction and object lens of light beam, described multiaspect reflection-type prism and this collimation lens are integrated components, this multiaspect reflection-type prism has an incidence surface and an exiting surface, and this incidence surface and exiting surface are angled, the incidence surface that this light Transmit-Receive Unit is positioned at this multiaspect reflection-type prism is oppositely arranged, it has a light emitting devices to send the light signal that inputs to optical disc surface and an optical detection device to be received from the light signal that optical disc surface returns, this collimation lens changes into parallel beam with the divergent beams of input, or parallel beam changed into convergent beam, and vertical incidence to the light signal of this multiaspect reflection-type prism incidence surface can be perpendicular to the exiting surface outgoing of this multiaspect reflection-type prism after reflection between the surface of multiaspect reflection-type prism.
Compared with prior art, optical read/write device of the present invention adopts a multiaspect reflection-type prism, reflect between surface by this multi-surface reflection prism, be implemented in and shorten distance between optical module under the situation that need not reduce total optical path length, and its incidence surface and the exiting surface each other angled transmission direction that changes light beam thus make the optical module that need be positioned at same optical axis in the prior art move on the axis of different directions, reduce the length of optical read/write device on single direction thus, thereby reduce to assemble the size of the optical data recording/reproducing device movement of optical read/write device, realize the optical data recording/reproducing device miniaturization.
[description of drawings]
Fig. 1 is the optical read/write device synoptic diagram of prior art.
Fig. 2 is the optical read/write device synoptic diagram of first embodiment of the invention.
Fig. 3 is the vertical view of part assembly of the optical read/write device of first embodiment of the invention.
Fig. 4 is the optical read/write device synoptic diagram of second embodiment of the invention.
[embodiment]
See also Fig. 2 and Fig. 3, it is first embodiment of optical read/write device of the present invention, and this optical read/write device 2 has a smooth Transmit-Receive Unit 20, a diffraction grating 21, a multi-surface reflection prism 22, collimation lens 23, a light path transition components 24 and object lens 25.
This multi-surface reflection prism 22 is to adopt First Five-Year Plan angle prism in the present embodiment, comprise pentagon bottom surface and end face, and first, second, the 3rd, the 4th, the 5th side (221,222,223,224,225) five sides that link to each other successively, wherein first side 221 and the 5th side 225 are incidence surface and exiting surface, the two vertical mutually setting, first, second side 221,222, second, the 3rd side 222,223, the 3rd, the 4th side 223,224, the and the 4th, the 5th side 224,225 angle all is made as 112.5 degree, but it also can be other angle, satisfy the light signal of vertical incidence to incidence surface 221, after reflecting mutually between the surface of multi-surface reflection prism 22, can be perpendicular to exiting surface 225 outgoing, thereby make light beam behind this multi-surface reflection prism 22, transmission direction changes 90 degree.
Light Transmit-Receive Unit 20 is located at incidence surface 221 1 sides of multi-surface reflection prism 22 with diffraction grating 21, and the axis a that is positioned at this incidence surface 221 goes up and incidence surface 221 faces.This light Transmit-Receive Unit 20 is integrated semiconductor modules, and it comprises that a lasing light emitter 200 to send the light signal of specific wavelength, reaches a detection components 201 to be received from the light signal that optical disc surface returns.This diffraction grating 21 is provided with over against light Transmit-Receive Unit 20, and it is the secondary optics assembly, to optical disc surface, reflects the light signal that returns from optical disc surface simultaneously so that it falls into the receiving surface of detection components 201 with optical signal transmission that lasing light emitter 200 is sent.
During the work of optical read/write device, lasing light emitter 200 sends the light signal of specific wavelength to form an outgoing beam.The size of its wavelength is by data memory format decision, and during as the data of read/write CD form, this wavelength is about 780nm, and during as the data of read/write DVD form, this wavelength is about 650nm, and during as the data of read/write HD-DVD form, this wavelength is about 405nm.This outgoing beam inputs to the incidence surface 221 of multi-surface reflection prism 22 behind diffraction grating 21, and be incident to the 4th side 224 of multi-surface reflection prism 22, the 4th side 224 reflexes to second side 222 with this outgoing beam, and second side 222 will be from the beam reflection of the 4th side 224 to exiting surface 225, and via exiting surface 225 outputs.Be (225 angles of incidence surface 221 and exiting surface are 90 degree, and angle is 112.5 degree between all the other sides) owing to angle between the side of this multi-surface reflection prism 22 becomes specific angle to close, vertical incidence to the light signal of incidence surface 221 can be perpendicular to exiting surface 225 outgoing.Input to object lens 25 after the light beam of multi-surface reflection prism 22 outputs changes into parallel beam by collimation lens 23, object lens 25 converge to it on CD correspondence position of (figure does not show), and are reflected to form a Returning beam by it.The light path of this Returning beam and the light path of outgoing beam are basic identical, when Returning beam when being located at the diffraction grating 21 of 20 of multi-surface reflection prism 22 and light Transmit-Receive Units, this Returning beam can reflect, and makes it fall into the receiving area of detection components 201.
Hence one can see that, reflects between the surface by multi-surface reflection prism 22, can be implemented under the situation that the light transmission distance of diffraction grating 21 and collimation lens 23 do not shorten, and reduces the actual range of diffraction grating 21 and collimation lens 23.The light beam that is incident to multi-surface reflection prism 22 is along the axis a axle transmission of the incidence surface 221 of multi-surface reflection prism 22, and is axis b axle transmission along the exiting surface 225 of multi-surface reflection prism 22 by the light beam of these multi-surface reflection prism 22 outgoing.The certain angle theta of tool between incidence surface and exiting surface, thereby a, b axis can change the transmission direction of light beam thus not on same direction.
This multi-surface reflection prism 22 is not limited in five jiaos of prism structures of first embodiment, and it also can be other polyhedral structure.But need meet the following conditions: need have an incidence surface 221 and an exiting surface 225, and the certain angle theta of tool between this two surface, change the big I of θ and change the optic path direction; And the angle between adjacently situated surfaces need satisfy certain condition, so that vertical incidence is to the light signal of incidence surface 221, after reflecting mutually between the surface of multi-surface reflection prism 22, perpendicular to exiting surface 225 outgoing.
See also Fig. 4, it is second embodiment of optical read/write device of the present invention, this optical read/write device 2 ' basic identical with the optical read/write device 2 of first embodiment, the position of its optical module and the transmission path of light path are identical with first embodiment, but the two difference part is, the integrated component of the multi-surface reflection prism 22 of second embodiment ' form by processes such as injection mo(u)ldings with collimator apparatus 23 ' be, this collimator apparatus 23 ' be formed at multi-surface reflection prism 22 ' exit surface on, its have a curved surface 230 relative with the exiting surface of multiaspect reflection-type prism ', to realize convergence function.
Claims (9)
1. optical read/write device, mainly comprise a smooth Transmit-Receive Unit, one divergent beams with input change into parallel beam or parallel beam are changed into the collimation lens of convergent beam, one changes the light path transition components and object lens of the transmission direction of light beam, described smooth Transmit-Receive Unit is used to send the light signal that inputs to optical disc surface and is received from the light signal that optical disc surface returns, it is characterized in that: described optical read/write device further comprises a multiaspect reflection-type prism, described multiaspect reflection-type prism and this collimation lens are integrated components, this multiaspect reflection-type prism has an incidence surface and an exiting surface, and incidence surface and exiting surface are angled, described smooth Transmit-Receive Unit and this incidence surface are oppositely arranged, and the light signal that impinges perpendicularly on this incidence surface is after reflection between the surface of multiaspect reflection-type prism
Perpendicular to this exiting surface outgoing.
2. optical read/write device according to claim 1 is characterized in that: the incidence surface of described multiaspect reflection-type prism and exiting surface angulation are 90 degree.
3. optical read/write device according to claim 2 is characterized in that: the incidence surface of described multiaspect reflection-type prism and exiting surface are adjacent two surfaces.
4. optical read/write device according to claim 3 is characterized in that: described multiaspect reflection-type prism is five jiaos of prisms.
5. optical read/write device according to claim 4 is characterized in that: to remove incidence surface and exiting surface be 90 to be outside one's consideration to angle between the side of described five jiaos of prisms, and the residue angle is all 112.5 and spends.
6. optical read/write device according to claim 1 is characterized in that: described collimation lens is positioned on the exiting surface of this multiaspect reflection-type prism.
7. optical read/write device according to claim 6 is characterized in that: described collimation lens have one with the relative curved surface of exiting surface of multiaspect reflection-type prism.
8. optical read/write device according to claim 1 is characterized in that: be provided with a diffraction grating between described smooth Transmit-Receive Unit and multiaspect reflection-type prism, this diffraction grating is right against described smooth Transmit-Receive Unit.
9. optical read/write device according to claim 8 is characterized in that: described smooth Transmit-Receive Unit is an integrated semiconductor module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100265193A CN100454409C (en) | 2004-03-12 | 2004-03-12 | Optical read / write device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100265193A CN100454409C (en) | 2004-03-12 | 2004-03-12 | Optical read / write device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1667724A CN1667724A (en) | 2005-09-14 |
| CN100454409C true CN100454409C (en) | 2009-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100265193A Expired - Fee Related CN100454409C (en) | 2004-03-12 | 2004-03-12 | Optical read / write device |
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| Country | Link |
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| CN (1) | CN100454409C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103533221A (en) * | 2013-09-27 | 2014-01-22 | 中山联合光电科技有限公司 | Camera lens device capable of shooting in two directions and mobile phone provided with camera lens device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1187004A (en) * | 1996-12-30 | 1998-07-08 | 大宇电子株式会社 | Dual focus optical pickup apparatus |
| CN1427403A (en) * | 2001-12-21 | 2003-07-02 | 迪维安公司 | Optical path system of video disk |
| CN1466133A (en) * | 2002-07-01 | 2004-01-07 | 汕头高新区和川光电科技有限公司 | Optical read/write device |
| CN1475999A (en) * | 2002-07-04 | 2004-02-18 | 索尼公司 | Optical pickup apparatus and signal recording and/or reproducing apparatus |
-
2004
- 2004-03-12 CN CNB2004100265193A patent/CN100454409C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1187004A (en) * | 1996-12-30 | 1998-07-08 | 大宇电子株式会社 | Dual focus optical pickup apparatus |
| CN1427403A (en) * | 2001-12-21 | 2003-07-02 | 迪维安公司 | Optical path system of video disk |
| CN1466133A (en) * | 2002-07-01 | 2004-01-07 | 汕头高新区和川光电科技有限公司 | Optical read/write device |
| CN1475999A (en) * | 2002-07-04 | 2004-02-18 | 索尼公司 | Optical pickup apparatus and signal recording and/or reproducing apparatus |
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| Publication number | Publication date |
|---|---|
| CN1667724A (en) | 2005-09-14 |
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