Compact optical pick-up lead with a vertically inclined substrat

Details Compact optical pick-up lead with a vertically inclined substrat Compact optical pick-up lead with a vertically inclined substrat

1996-02-16

1998-01-06

Nelms, David C.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4414, 369 4412, 369121, 369 4432, G11B 708

Patent

active

057062706

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to an optical pick-up device, and more particularly to an optical pick-up device using a light-emitting and receiving unit which includes a light-emitting element and a light-receiving element both formed integrally on a common substrate.


BACKGROUND ART

It is hitherto known that an optical recording medium such as an optical disc is used as a recording medium for a recording and/or reproducing apparatus. In the recording and/or reproducing apparatus of such a type, an optical pick-up device is provided to write and/or read out information signals on the optical recording medium. The optical pick-up device includes a light-emitting element such as a semiconductor laser for emitting a light beam and a light receiving element such as a photodetector. The optical pick-up device has a function for carrying out recording of information signals on the optical recording medium by radiating the light beam thereon, or reproducing of the information signals on the optical recording medium by detecting a returning light reflected on the optical recording medium by the light receiving element.
The optical pick-up device is provided with an objective lens which serves for focusing and radiating a light beam emitted from the light-emitting element on a signal recording surface of the optical recording medium.
Further, the optical pick-up device is provided with an objective lens-driving device for controllably driving the objective lens both in the focusing direction parallel with an optical axis of the objective lens and in the tracking direction normal to the optical axis of the objective lens whereby the signal recording surface of the rotatably operated optical recording medium is allowed to be located at the position in a depth of focus of the light beam radiated through the objective lens and the light beam radiated through the objective lens is permitted to exactly follow recording tracks of the rotatably operated optical recording medium.
Meanwhile, with respect to the recording and/or reproducing apparatus of the type in which an optical recording medium is used, there has been a demand for realizing compactness and thinness of the apparatus. Actually, recording and/or reproducing apparatuses currently used have such a small size as approximately similar to an outer diameter of the optical recording medium to be loaded thereon. In addition, since the optical recording medium is capable of recording information signals with a high density, there has been proposed and employed the recording and/or reproducing apparatus on which the optical recording medium having a size as small as 64 mm or less can be loaded. However, there is still a further demand for compactness and thinness of the recording and/or reproducing apparatus.
In order to realize the compactness and thin thickness of the recording and/or reproducing apparatus, it is necessary to achieve a compactness and a thinness of an optical pick-up device which serves as a means for recording and/or reproducing information signals on the optical recording medium.
For the purpose of achieving the compactness and thinness of the optical pick-up device, known optical pick-up device has, for example, such a structure that the light beam to be radiated on the optical recording medium is first emitted in the direction normal to an optical axis of an objective lens and then deflected by a light path-changing means such as a light-turning mirror to thereby introduce the light beam into the objective lens.
Thus, by emitting the light beam in the direction normal to the optical axis of the objective lens, it becomes possible to reduce a height between the light-emitting element and the objective lens whereby compactness of the optical pick-up device is achievable. Further, another proposal has been made to realize the compactness of the optical pick-up device, in which the light-emitting element for emitting the light beam and a light-receiving element for detecting the returning light reflected on the optical recording medium a

REFERENCES:
patent: 5406543 (1995-04-01), Kobayashi et al.
patent: 5440533 (1995-08-01), Fujimaki et al.
patent: 5465242 (1995-11-01), Terashima et al.
patent: 5513121 (1996-04-01), Sugawara et al.

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