Unlock instant, AI-driven research and patent intelligence for your innovation.

Light integration unit and optical pickup device

An integrated unit, photosensitive element technology, applied in the direction of integrated optical head device, beam guide device, optical element, etc., can solve the problems of reduced light utilization efficiency, increased light source output, shortened working life, etc., and achieves resolution in the direction of the time axis. rate improvement, S/N ratio improvement, small reduction effect

Inactive Publication Date: 2006-11-01
SHARP KK
View PDF2 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Here, too, it was found that a large amount of light loss occurs, which is one of the causes of a decrease in light utilization efficiency.
[0011] Furthermore, when the returning light 112 passes through the linear diffraction grating or the holographic diffraction grating 104, light loss is also generated, resulting in a further reduction in light utilization efficiency.
[0012] Considering this decrease in light utilization efficiency, when designing an optical pickup device, in order to achieve stable recording and reproduction performance, it is necessary to further increase the output from the light source.
However, when the output of the semiconductor laser is increased, there is a problem that the operating life becomes shorter
[0013] The problem of the above-mentioned reduction in light utilization efficiency is not limited to the optical pickup of the linear diffraction grating or the holographic diffraction grating having the function of correcting the light intensity distribution described in Patent Document 1. optical pick-up, also suitable for

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Light integration unit and optical pickup device
  • Light integration unit and optical pickup device
  • Light integration unit and optical pickup device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0050] According to Figure 1(a), Figure 1(b) to Figure 7(a) , FIG. 7(b) illustrates an embodiment of the present invention as follows.

[0051] In this embodiment, a case where the optical integrated unit of the present invention is used for an optical pickup included in an optical information recording and reproducing device for optically recording and reproducing information on an optical disc (optical information recording medium) will be described.

[0052] figure 2 It is a schematic diagram showing the composition of the optical pickup device 40 using the optical integrated unit of this embodiment.

[0053] Such as figure 2 As shown, the optical pickup device 40 has an optical integration unit 1 , a collimator lens 2 , and an objective lens 3 .

[0054] figure 2 Among them, the light beam emitted from the light source installed in the optical integration unit 1 is turned into parallel light by the collimator lens 2 and then converged to the optical disc 4 through ...

Embodiment approach 2

[0156] Another embodiment of the present invention is described below with reference to FIG. 8( a ) and FIG. 8( b ). In this embodiment, differences from Embodiment 1 will be described. For convenience of description, members having the same functions as those described in Embodiment 1 are given the same reference numerals, and description thereof will be omitted.

[0157] 8( a ) and FIG. 8( b ) are composition diagrams showing the composition of an optical integration unit according to Embodiment 2 of the present invention. Fig. 8 (a) is a side view viewed from the y direction with respect to the shown optical axis direction (z direction), and Fig. 8 (b) is for illustrating the arrangement relationship between the semiconductor laser 11 and the photosensitive element 12 in the package 17. A plan view of the package 17 is seen from the optical axis direction (z direction) shown in FIG. 8( a ) (that is, from the window 17 d side of the cover 17 c ).

[0158] In the optical int...

Embodiment approach 3

[0170] according to Figure 10 Another embodiment of the present invention will be described as follows. In this embodiment, differences from Embodiment 1 will be described. For convenience of description, members having the same functions as those described in Embodiment 1 are given the same reference numerals, and description thereof will be omitted.

[0171] Figure 10 It is a side view seen from the y direction with respect to the optical axis direction (z direction) showing the composition of the optical integration unit according to Embodiment 3 of the present invention. In the optical integrated unit of the present embodiment, the composition of the semiconductor laser 11 and the photosensitive element 12 in the optical integrated unit of the first embodiment is different.

[0172] That is, in Embodiment 1 described above, the semiconductor laser 11 and the photosensitive element 12 are arranged in the package 17 as they are. In contrast, as Figure 10 As shown, in ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

In order to realize a more stable recording / reproducing performance by minimizing decrease of light utilization efficiency, an optical integrated unit 1 of the present invention includes: (i) a semiconductor laser 11 for emitting a light beam 20 to an optical disk 4 ; (ii) a light receiving element 12 for receiving returning light, which is the light beam 20 reflected by the optical disk 4 ; (iii) a transparent element 15 for diffracting P polarization component light of the light beam 20 in a direction toward the optical disk 4 , and for diffracting S polarization component light of the returning light in a direction toward the light receiving element; and (iv) a 1 / 4 wavelength plate 16 that is provided on a portion, through which the returning light enters the transparent element 15 , of the transparent element 15 , and that converts the returning light into the S polarization component light.

Description

field of invention [0001] The present invention relates to an optical integrated unit and an optical pick-up device; in detail, it relates to an optical integrated unit for realizing miniaturization of an optical pickup used for recording or reproducing information on an optical information recording medium such as an optical disc, and an optical integrated unit using the optical integrated unit. Pickup device. Background of the invention [0002] In recent years, in order to record large-capacity messages, it is strongly desired to increase the density and capacity of information recording media such as optical discs and other optical information recording media, and to reduce the size of optical pickup devices for mobile use. [0003] Therefore, various integrated optical pickups have been proposed in response to the demand for miniaturization and quantization. Most of these integrated optical pickups use semiconductor lasers as light sources. However, in an optical pick...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/125G11B7/135
CPCG02B5/32G11B7/0943G11B7/131G11B7/1353G11B7/1365G11B7/1369G11B7/13925G11B7/123
Inventor 金泽泰德堀山真
Owner SHARP KK