JPS61261830A - Image information processor - Google Patents

Abstract

PURPOSE:To stabilize information processing by rocking a head arm assembly through a head arm assembly swinging means composed of a rotary motor around a heavy main member side where an optical detection system is built as a center of rotation. CONSTITUTION:The head arm assembly 3 consists of a main member which is provided rotatably around a shaft 5a parallel to the center of rotation of an optical disk 1 and includes the optical detection system 20, a head arm 10 which is held on the base end part of the main member and has an optical axis conduction part internally, and a head 14 which is provided atop of the head arm 10 and contains an objective optical system 13. This head arm assembly 3 is rocked through the head arm assembly rocking means 4 around a heavy main member side to move a light head 14 on the optical disk 1 radially. Therefore, the constitution is simple and the moment of inertia is small; and speedy access is attained and the optical path length is constant, thereby performing stable information processing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement of an image information processing apparatus using an optical disk as an information storage medium.

[Technical background of the invention and its problems]

Recently, image information processing devices that use optical disks as storage media can greatly increase the information storage capacity compared to the conventionally widely used magnetic image information processing devices, and are extremely stable and stable with little noise. In addition to being able to obtain a playback state that is highly stable, the storage state is extremely stable as it is not easily affected by external influences, and information processing can be performed in a non-contact state, with no negative effects such as damage to the storage medium or information processing head. It is becoming widely used due to its unique features.

However, in the past, when moving the objective optical system in the radial direction of the optical disk to access the optical disk, a linear motor was used to move the entire optical head, or only the objective lens and lens actuator were moved for optical detection. A method was used in which the system was fixed, but the former method requires a large moment of inertia due to the movement of a heavy head, making it difficult to expect very fast access, and the latter method has an indefinite length of optical path, making it difficult to adjust. There have been problems such as the possibility that detection may become unstable even if there is a misalignment.

[Purpose of the invention]

The present invention was made based on the above circumstances, and its purpose is to provide a relatively simple structure with a small moment of inertia, allowing quick access, and a stable optical path with a constant optical path length. The present invention provides an image information processing device that can perform information processing.

[Summary of the invention]

In order to achieve the above object, the present invention provides an image information processing system which enables access to the optical disc by moving an objective optical system in the radial direction of the optical disc, and in which the center of rotation of the optical disc is A main member that is rotatable about parallel axes and has an optical detection system built into it, a head arm whose proximal end is held by the main member and whose interior is an optical axis conduction part, and this head arm. A head provided at the tip of the head and housing the objective optical system therein constitutes a head arm assembly, and an optical detection system is incorporated into this head arm assembly via a head arm assembly swinging means consisting of a rotating motor. The main member, which is heavy and heavy, is rotated as the center of rotation, and a light head containing an objective optical system is moved in the radial direction of the optical disc.

(Example of the invention) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

1 and 2 schematically show the configuration of the main parts of the image information processing device. In the figures, 1 is an optical disk, and the optical disk 1 is held with its center of rotation in the vertical direction, not shown. The drive means rotates in a predetermined direction at a constant speed.

Further, a reading unit 2 as an information processing unit is arranged near the optical disc 1.

The reading unit 2 is comprised of a head arm assembly 3 and a head arm assembly swinging means 4 for swinging the head arm assembly 3 by a required amount.

The head arm assembly swinging means 4 includes a rotary motor 5, and the head arm assembly 3 is attached to a drive shaft 5a provided parallel to the central axis of rotation of the optical disc 1. The head 14 of the head arm assembly 3 is configured to swing in the radial direction of the optical disc 1 (in the six directions of arrows in FIG. 2) in response to the rotation of the rotary motor 5.

Further, the head arm assembly 3 has a configuration as shown below. That is, in the figure, reference numeral 10 denotes an objective optical system 13 consisting of an objective lens 11 and a prism 12, which are movable by a known lens actuator (not shown) at the tip.
The base end of the head arm 10 has a bolt 8 attached to the drive shaft 5a.
It is held by the main member 15 fixed via.

The main member 15 has an optical detection system 20 incorporated therein. That is, the first laser beam consisting of the λ/4 plate 21, the polarizing beam splitter 22, the collimator lens 23, and the laser oscillator 24 is aligned with the extension line of the optical axis of the laser beam a passing through the Herad arm 10.
The optical system 20a is arranged to guide the laser beam a to the optical disk 1 via the objective optical system 13, and its reflected light is deflected by 90 degrees by the polarizing beam splitter 22. There is. A second optical system 20b consisting of a half prism 25, a light projecting lens 26, and a photodetector 27 is disposed in the direction of polarization of the reflected light by the polarizing beam splitter 22, so as to read information and detect track deviation. It has become. Furthermore, in the direction of reflection of the reflected light by the half prism 25, a third optical system 20 consisting of a light projecting lens 28 and a photodetector 29 is provided.
c is arranged to detect out-of-focus.

The head arm assembly 3 is configured to be rotated by a predetermined angle by applying a drive signal voltage to the rotary motor 5.

Then, the head arm assembly 3 moves in the radial direction of the optical disc 1 (in the six directions of arrows in FIG. 2) in response to a search signal from a control section (not shown), and the head 14 at the end of the head arm 10 searches for predetermined search information. and will start a read operation.

〔Effect of the invention〕

The present invention provides an image information processing device that can access the optical disc by moving the objective optical system in the radial direction of the optical disc, as described above, in which the optical disc is moved along an axis parallel to the rotation center of the optical disc. A main member that is rotatably provided as a center and has an optical detection system built in; a head arm whose proximal end is held by this main member and whose interior is an optical axis conduction part; and a head arm that is provided at the tip of this head arm. A head arm assembly is constructed from the head, which houses the above-mentioned objective optical system inside, and the head arm assembly is connected to a heavy main body in which an optical detection system is incorporated via a head arm assembly swinging means consisting of a rotating motor. This device is designed to swing with the member side as the center of rotation, and move a light head with a built-in objective optical system in the radial direction of the optical disk. Therefore, although it has a relatively simple configuration, the moment of inertia is small and fast access is possible, the optical path length is constant and stable information processing can be performed, and since the drive source is a rotary motor, the configuration can be simplified. be effective.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic side view showing the configuration of a desk handling mechanism that is a main part of an image information processing apparatus, and FIG. 2 is a plan view. 1... Optical disc, 2... Reading unit, 3...
- Head arm assembly, 4... Head arm assembly swinging means (rotary motor), 13... Objective optical system, 30.
...Voice motor coil, 20...Optical detection system, 20
a...first optical system, 20b...second optical system, -
〇- 2'Oc...Third optical system, 21...λ/44fi
i, 22... Polarizing beam splitter, 23... Collimator lens, 24... Laser oscillator, 25... Half prism, 26... Light projecting lens, 27... Photodetector, 28... - Light projection lens, 29... photodetector. Applicant's agent Patent attorney Takehiko Suzue-10=

Claims (3)

[Claims] (1) An image information processing device capable of accessing the optical disk by moving an objective optical system in the radial direction of the optical disk, the device being rotatable about an axis parallel to the center of rotation of the optical disk. a main member in which the optical detection system is incorporated; a head arm whose proximal end is held by the main member and whose interior serves as an optical axis conduction section; and a head arm provided at the tip of the head arm and with the objective optical system inside. A head arm assembly having a head housing a head, and a rotation that moves the objective optical system in the radial direction of the optical disk by swinging the head arm assembly around the other end of the main member in which the optical detection system is incorporated. 1. An image information processing device comprising a head arm assembly swinging means comprising a motor. (2) The image information processing apparatus according to claim 1, wherein the objective optical system includes an objective lens and a deflection member that are movable by a lens actuator. (3) A λ/4 plate, a polarizing beam splitter, a collimator lens, and a laser oscillator are arranged so that the optical detection system coincides with the extension line of the optical axis of the laser beam of the head arm, and the laser beam is transferred to the objective optical system. a first optical system that guides the reflected light to the optical disk via the system and deflects the reflected light by 90 degrees by the polarizing beam splitter; and a half prism arranged in the direction of polarization of the reflected light by the polarizing beam splitter of the first optical system. , a second optical system having a light projecting lens and a photodetector for reading information and detecting track deviation, and a light projecting lens and a photodetector disposed in the direction in which the light reflected by the half prism is reflected. 2. The image information processing apparatus according to claim 1, further comprising a third optical system for detecting defocus.