The Design of an Integrated Pick-Up Head for High-Density Digital Versatile Disk, Digital Versatile Disk and Compact Disk

2007 ◽  
Vol 364-366 ◽  
pp. 156-159
Author(s):  
Wen Shing Sun ◽  
Ching Cherng Sun
Keyword(s):  
Beam Splitter ◽  
Optical Axis ◽  
High Density ◽  
Objective Lens ◽  
Compact Disk ◽  
Optical Pickup ◽  
Optical Pickup Head ◽  
Novel Design ◽  
Digital Versatile Disk ◽  
Collimating Lens

A novel design of triple-wavelength design for a compact optical pickup head is presented here. We propose the use of two rhomboid beam-splitter prisms for HD-DVD, DVD and CD devices to align signals with three different wavelengths on the same optical axis. The light is collimated by a collimating lens. The parallel beams are incident on the wavelength selector. The wavelength selector separates the wavelengths with different numerical apertures. The different wavelength signals are focused on the disc by an objective lens.

Triple-wavelength optical pickup head designs for compact disk, digital versatile disk and high-density digital versatile disk devices

2005 ◽  
Vol 52 (17) ◽  
pp. 2523-2547 ◽  
Author(s):  
Wen-Shing Sun ◽  
Ching-Cherng Sun * ◽  
Jen-Tsorng Chang ◽  
Chuen-Lin Tien ◽  
Shih-Hsin Ma ◽  
...  
Keyword(s):  
High Density ◽  
Compact Disk ◽  
Optical Pickup ◽  
Optical Pickup Head ◽  
Digital Versatile Disk

Compact Disk/Digital Video Disk(CD/DVD)-Compatible Optical Pickup Actuator for High Density and High Speed

1998 ◽  
Vol 37 (Part 1, No. 4B) ◽  
pp. 2189-2196 ◽  
Author(s):  
In-Ho Choi ◽  
Won-Eull Chung ◽  
Young-Joong Kim ◽  
In-Seop Eom ◽  
Ho-Man Park ◽  
...  
Keyword(s):  
High Speed ◽  
Digital Video ◽  
High Density ◽  
Compact Disk ◽  
Optical Pickup ◽  
Digital Video Disk

scholarly journals Micro objective lens with NA 065 for the bluelight small-form-factor optical pickup head

2008 ◽  
Vol 16 (17) ◽  
pp. 13150 ◽  
Author(s):  
Hsi-Fu Shih ◽  
Yuan-Chin Lee ◽  
Yi Chiu ◽  
David Wei-Chung Chao ◽  
Gung-Ding Lin ◽  
...  
Keyword(s):  
Form Factor ◽  
Objective Lens ◽  
Optical Pickup ◽  
Small Form ◽  
Optical Pickup Head ◽  
Small Form Factor

The Yellow-Ring Measurement of White LED by the Reflective Lightspot Method (RLM)

2013 ◽  
Vol 284-287 ◽  
pp. 2805-2811
Author(s):  
Ching Ching Yang ◽  
Hsin Yi Tsai ◽  
Wen Tse Hsiao ◽  
Kuo Cheng Huang
Keyword(s):  
Beam Splitter ◽  
Optical Axis ◽  
Ccd Camera ◽  
White Led ◽  
Automatic Inspection ◽  
Phosphor Layer ◽  
The Real ◽  
Acrylic Plate ◽  
Working Distance ◽  
Plm System

The yellow-ring (YR) is a chromatism phenomenon which is caused by the inhomogeneous phosphor layer of the white-light LED (WLED). The characterized lightspot with YR is that the yellow light appears in the periphery of white lightspot zone. The lightspot image of WLED can be acquired from two approaches; projective lightspot method (PLM) and transmissive lightspot method (TLM). By the PLM system, the lightspot could be projected on the spot screen (wall or others) and its image is acquired by a CCD camera. However, the working distance between camera and sample WLED must be larger (~ 2 m) to obtain the lightspot image without tilt aberration. For the convenience of automatic inspection, the working distance in the TLM system can be modified to 0.3 m. Since the light travels through the spot screen, such as copier paper or acrylic plate, etc., the camera cannot obtain the real lightspot image in the TLM system. In practice, the material of spot screen will absorb and scatter the WLED light, and in the image color would be a bit different between the real lightspot and the acquired lightspot. In order to improve the above disadvantages, the study presents the reflective lightspot method (RLM) that the camera acquires the reflective lightspot image from the 50/50 beam splitter at the same optical axis. The RLM system is not only able to capture the tilt-less lightspot image, but also obtain readily the non-saturated image. The experiment results show the RLM system has the better evaluation of YR index (YRI), and is more suitable for the automatic inspection of WLEDs.

Recent advances in optical pickup head with holographic optical elements

1991 ◽  
Author(s):  
Makoto Kato ◽  
Shin-ichi Kadowaki ◽  
Yoshiaki Komma ◽  
Yoshikazu Hori
Keyword(s):  
Optical Pickup ◽  
Optical Elements ◽  
Holographic Optical Elements ◽  
Recent Advances ◽  
Optical Pickup Head

scholarly journals Extended Dual-Focus Microscopy for Ratiometric-Based 3D Movement Tracking

2020 ◽  
Vol 10 (18) ◽  
pp. 6243
Author(s):  
Seohyun Lee ◽  
Hyuno Kim ◽  
Hideo Higuchi
Keyword(s):  
Drug Delivery ◽  
High Resolution ◽  
Optical Axis ◽  
Three Dimensional ◽  
Virus Transmission ◽  
Living Cells ◽  
Depth Of Field ◽  
Objective Lens ◽  
Accurate Localization ◽  
Movement Tracking

Imaging the three-dimensional movement of small organelles in living cells can provide key information for the dynamics of drug delivery and virus transmission in biomedical disciplines. To stably monitor such intracellular motion using microscope, long depth of field along optical axis and accurate three-dimensional tracking are simultaneously required. In the present work, we suggest an extended dual-focus optics microscopy system by combining a bifocal plane imaging scheme and objective lens oscillation, which enables accurate localization for a long axial range. The proposed system exploits high-resolution functionality by concatenating partial calibration result acquired each axial imaging level, maintaining the practical advantages of ratiometric method.

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