JPS63214935A - Reading head for compact disk - Google Patents

Abstract

PURPOSE:To simplify the constitution of a player, to make the player resistant to external vibration and to lighten and miniaturize the player by arraying many sensors consisting of light emitting elements and light receiving elements corresponding to the tracks of a compact disk. CONSTITUTION:A reading head 2 is fixed in a specified spot in the player in order to face a rotating compact disk 1 and has at least the length equal to the width of the information recorded part on the radius of the compact disk 1, and also many light emitting elements 21 and light receiving elements 22 are arrayed along longitudinal direction. Namely the sensors consisting of the light emitting elements and the light receiving elements are arrayed corresponding to the tracks of the compact disk 1 and the respective sensors respectively read out a bit of information on the corresponding tracks. Therefore, in the case of reading out the information, a driving mechanism for moving the reading head is not needed because only to pick up the output from the facing sensors consisting of light emitting elements 21 and light receiving elements 22, without moving the reading head. Thus, the constitution of the player can be simplified and made resistant to external vibration and also it can be lightened and miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to improvements in read heads for compact discs.

[Conventional technology]

Compact discs have high sound quality, are small and convenient to carry, and can be used semi-permanently without wearing out no matter how many times they are used because they are traced with a laser beam without contact. Recently, it has become more widely used than traditional analog discs (records) because it has many advantages, such as the ability to record time, index numbers, and other information, allowing various convenient playback methods. It's coming.

It is also used not only in the audio field, but also as a high-density recording medium for various data, such as converting conventional telephone directories into compact discs.

The signal reading head of a conventional compact disc player is a combination of one or two or three laser emitting elements, one or two or three corresponding light receiving elements, and a set of prisms or lenses. The reading head is moved along the radial direction of the rotating compact disc to read signals at a desired location on the compact disc.

Therefore, a precise drive mechanism consisting of a motor and a transmission part is required to move the reading head, which makes the player's configuration complicated and expensive, and it is susceptible to external vibrations, increasing the number of causes of failure. However, there are many other problems, such as making it difficult to reduce the weight and size of the device, and furthermore, the drive mechanism generates vibrations that are undesirable for music reproduction, and the drive circuit generates noise.

[Problem that the invention seeks to solve]

The present invention has been made to solve the above problems, and its purpose is to simplify the configuration of the player without requiring a drive mechanism for the reading head, and to be resistant to external vibrations and prevent reading errors. There are no problems, and there are few failures.
An object of the present invention is to provide a compact disc reading head that does not generate vibration or noise and allows the device to be made lighter and smaller.

[Means for solving problems]

The above object is achieved by a compact disc read head comprising a plurality of sensors comprising a light emitting element and a light receiving element arranged in correspondence with the tracks of the compact disc.

[For production]

With the reading head configured as described above, sensors consisting of a large number of light emitting elements and light receiving elements are arranged on the head in correspondence with the tracks of the compact disc, so when reading the signal of a desired track, it is necessary to read the signal of the desired track. All you have to do is make the light-emitting element of the sensor corresponding to the trunk emit light and take out the output signal of the light-receiving element.There is no need to move these sensors.Therefore, there is no need for a conventional reading head drive mechanism. becomes easier,
It is resistant to external imaging, does not cause reading errors, has few failures, does not generate vibrations or noise, and allows the device to be made lighter and smaller.

〔Example〕

Hereinafter, the configuration of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is an explanatory diagram showing the arrangement of a compact disc reading head according to the present invention in a compact disc player, and FIG. 2 is a partially enlarged perspective view of the compact disc reading head according to the present invention. FIG. 3 is an explanatory diagram showing the arrangement of a conventional reading head in a compact disc player. In the figure, numeral 1 indicates a compact disc placed on a rotating tray (not shown) and rotated at a predetermined speed during playback. , 2 is a reading head according to the present invention,
3 is a conventional read head.

As shown in FIG. 3, the conventional reading head 3 is designed so that the reading head 3 faces the track to be reproduced on the rotating compact disc 1 during the reproduction period of the compact disc 1. As mentioned above, a precise and complicated drive mechanism is required for this purpose.

In contrast, the reading head 2 according to the present invention is fixed at a predetermined location within the player so as to face the rotating compact disc 1, as shown in FIG.

The reading device 2 has a length at least equivalent to the width of the information recording portion on the radius of the compact disc 1, and a large number of light emitting elements are arranged along its longitudinal direction as shown in FIG. 21.21 and light receiving elements 22.22 are arranged.

In other words, the sensor consisting of these light emitting elements and light receiving elements is
They are arranged to correspond to the trunk of the compact disc 1, and each sensor reads out information on the corresponding track.

Therefore, when reading out desired information, the light emitting element 21 facing the track does not have to move the reading head to the position of the trunk where the information is recorded as in the conventional case.
It is sufficient to pick up the output of the sensor consisting of the light receiving element 22 and the light receiving element 22, and therefore a drive mechanism for moving the reading head is not required.

As the light emitting element 21.21, an LED, a laser diode, or an optical fiber can be used, and as the light receiving element 22.22, a charge coupled device (COD) is suitable.

[Effects of the Invention] Since the present invention has a ridge-like structure, the present invention does not require a drive mechanism for the reading head, simplifying the structure of the player, and is resistant to external vibrations that may cause reading errors. There are no problems, there are few breakdowns, and there is no vibration or noise.
It is possible to provide a compact disc reading head that allows the device to be made lighter and smaller.

Note that the present invention is not limited to the embodiments on the ridges,
It is intended to encompass all modifications that may readily occur to those skilled in the art from the above description.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the arrangement of a compact disc reading head according to the present invention in a compact disc player, and FIG. 2 is a partially enlarged perspective view of the compact disc reading head according to the present invention. FIG. 3 is an explanatory diagram showing the arrangement of a conventional reading head in a compact disc player.

Claims (1)

[Claims] A reading head for a compact disc is made up of a plurality of sensors consisting of a light emitting element and a light receiving element arranged in correspondence with the tracks of the compact disc.