JPS58200470A - Disk reproducing device - Google Patents

Abstract

PURPOSE:To perform a noncontact and highly reliable pickup position detection, by providing a light source and an optical element on one side of a movable table and a photoelectric transfer element on the other side, and by using the output of the photoelectric transfer element as the reference voltage of the position detection voltage of a feed gear. CONSTITUTION:An LED or the rear output of a semiconductor laser is used for a light source 1. A cylindrical lens 2 is set on a movable table 3. The output of a photoelectric transfer element 4, which is fixed sufficiently away from the focusing position I of the lens 2, is picked up by an amplifier 5. By defining X as the distance from the position I to the element 4, theta as opening angle of the flux of light, L as the width of the flux of light at the position of the element 4, l as the length of receiving light and K as a constant, the output V0 of the amplifier 5 is expressed as V0approx.=l/Lapprox.=l/X.tanthetaapprox.=k.1/X, and it is in inverse proportion to the distance X. This fact can be used as a revolution reference when the revolution speed of the disk changes in inverse proportion to the distance from the center to the pickup position.

Description

[Detailed Description of the Invention] This product is a Pi disk-shaped recording medium [hereinafter referred to as De-Isk].
Video discs and 1'C1 that recorded information on ^W1 friends
The disc playback experience of the i-Audio Disk◆ is based on the non-contact and highly reliable pickup-5rt.
* digit m group? ! The object of the present invention is to provide an advantageous method for obtaining the Is electric ratio or the l electric ratio, which is the rough wI4 adjustment reference voltage color of the rotation of the disk.

Conventionally, in such cases, when searching for information tracks such as the beginning of a blog, the address number recorded for each information unit is detected in advance, and rare information is searched.
J to the deer with the number number.

This was accomplished by moving a pickup device or a rotating disk. In addition, if the difference in addresses is large, the voltage of the Bote 717M meter installed in the feed direction as a reference for adjusting the position of the pickup device or the output of a linear encoder with digital output to reduce wasted time. The desired track is searched by comparing the address signals after moving the relative positions of the pickup device and the disk relatively close together before comparing the addresses.

It went down. In the case of constant relative velocity recording (hereinafter abbreviated as 1CLV) proposed for PCM audio discs, etc., the (2) number of revolutions of the disc also needs to change depending on the position of the pickup device, so there are restrictions. If the position changes rapidly, it becomes difficult to read the synchronization signal, and the 1PI
There is a possibility that the school will become a flier.

Therefore, a potentiometer and some radius position detection means as described in aa are provided, and the internal rotation speed of the disk is roughly adjusted by means of the casing inertia shaft.

However, a VB meter such as the VB meter has a contact portion, so it has poor axis reliability, and the encoder has the disadvantage of being a crowbar.

The present invention rotates a recording medium of 1 yen M! The turntable is equipped with a turntable housing, a pickup device for reading information on the 0th recording medium, and a feeding device for driving the pickup device in the radial direction of the one-point recording medium, and supporting the button feeding device. Frame and pick-up! !
! One of the turtles is provided with an optical turtle that converges or diverges the light flux from the light source and this amount of light, and the other side is equipped with a
The light t that constantly receives the luminous flux emitted through the optical element l.
@Equipped with a rock conversion element.

Record the output voltage of this Marugame #L Nakediko and place 11 of the feeding device.
The main feature is that the rotation control L1 reference voltage is used for the rotation control of the rotary turntable or the rotation table, and the Heigo method is used.
．． The effect of being able to detect the position of the big-up 'kIk without touching the plate with high reliability and at low cost is achieved.

Hereinafter, two embodiments of the present invention will be described based on the map of Ayubata.
ζ翫1.

Figure 1m1 (-) (b) is a simple diagram of the principle. (I.J.
is a light source.

The rear output of an LED or semiconductor laser, or spectroscopy from another path, is used. (!It is a cylindrical μ lens that performs two-dimensional convergence (or divergence), and is placed on top of Tsukasa 1 (3). (4J is a separate lens body) Focus position (
1) A photoelectric conversion element fixed at a sufficiently distant location, the output of which is taken out by an amplifier (5). This first? At I3, from mtI focal point position).

The distance to the light*conversion element (4) is X, and the aperture angle of the light beam is θ.
, the width of the luminous flux at the position of the photoelectric conversion element (4) is one element Il
Let the light-receiving length of the l conversion element (4) be expressed as e, and the constant be expressed as K.

Said amplification lit! The output vo of (5) can be expressed as follows.

V,'::g/L '' g/(X-tanθ) =K・1/x Actually, it is necessary to multiply the above formula by the distribution function of light l, but choose a flat place with 1 distribution. is determined by whether the output is inversely proportional to l and !.This is a suitable rotation reference when the 19j rotation number of the disk is inversely proportional to the distance from the center to the pickup position and becomes 1, as in the case of CLV. It depends on the use, and if the m boundary etc. are placed in sufficient W science and engineering, it can also be used as a reference ratio for the turn dimple motor electric ratio during recording.

In addition, the calculation used as the criterion for the second search is such that sufficient accuracy can be obtained for rough adjustment by performing the calculation 1/x when converting the address number into the electrical ratio.

one! The figure has been processed to remove puffiness and light 11 (shadows of fluctuations in the 13th row war) of the parts in figure 1M1. However, (4) is the first photoelectric conversion element. (6) is a half-width, which guides a part of the luminous flux of light (1) to the second photoelectric conversion element (1). , the amplifier (through the division (9) path (from September onwards, the optical W* conversion element (4)
) side output B is hooked to the output A of the second photoelectric conversion element (7) hook. In addition, this division-path (as for the configuration of the axis,
Possible examples include those that hit in an analog manner, and those that perform ^/D conversion of one output and then process it in a digital N manner.

Furthermore, in the case of digital N-based processing, processing for reducing shadows due to the distribution of the amount of light described above can also be performed at the same time.

FIG. 3 is a detailed block diagram of a specific example using the device 1. (1) to (6) are the same components as in FIG. Reference numeral 9Q denotes a disk, which is rotated by a turntable motor (hereinafter referred to as TT MOMO) I at a specified rotation speed. (b) is the TT motor east one turn detection one.

The zero wheel that outputs a voltage proportional to one turn or the #1 wave number is a pickup device that detects the signal recorded on the disk.Depending on the method, the pickup element that reads the signal and the pickup element a note accurately detect the signal. Although leaflet elements such as focus, tracking, and time base for tracing columns are also included, detailed explanations thereof will be omitted.

The following explanation assumes that the recorded information signal and the above-mentioned servo detection signal are also included. and the synchronous portion WaS So. −
is the main control circuit of TT-1-Yu (B), and the 1m-
It performs a phase comparison and a j1 degree comparison with the output of the road ■ and the Il & number of the Jls quasi, and functions to change the rotation of the TT motor (b) to the positive continuation. (B) is a frequency-voltage converter (or amplifier) that converts the output of the Soki Tsumugi rotation detector wheel to 1 kft, which is proportional to the number of rotations and easy to handle. This is compared with the output of the increased rotation number of the position detection explained in FIG. Depending on the output of the device, the polar tree #& etc. must be folded, ill
Recording system - The output of one route is clearly written, passes through the extension Ia-1, and the TT motor (b) is controlled by the pongee. In the example, the reproduced period 0! The number is TT motor (b) ll1l
In the case where the main axis signal of 1llll is treated as a signal or the signal of -transition detection 11 (to) is treated as a royal signal, ζζ is also effective. The other six wheels are feed screws that work together with the feed motor (2) to drive the driving platform (on which the pickup scales are attached) in the radial direction of the disk wheels. In the embodiment, a U-shaped DC Tanabata is used for one feed motion, but a Z[11&& type motor such as a linear hairmotor can also be used to perform the same operation. 111 is a feed error detection circuit that extracts the low frequency voltage of the tracking signal.1 In normal playback operation, IFk! It passes through an amplifier circuit to drive the feed sensor (2), forming a feed servo that corrects the low w4a number component for the pickup device (2) to accurately follow the signal train. 4 is a differential amplifier that detects the difference between the position detection voltage of the amplifier (&) output and the target position voltage.
It is input to one switching terminal of the sensor and is switched as required by the output of the sensor k (2) to drive the feed motor and ensure that the difference between the target position voltage and the position Ill detection voltage ratio is almost zero. The feed position is roughly adjusted, and then
Correct position adjustment is achieved by sending and receiving signals between the command device (2) and the tracking hydrogen element in the pickup device (toward) and by moving the feed position using the feed error detection IGL path. The luck search operation is completed.

In the above embodiment, a light source (1) was provided on the hook of the pickup device, and a photoelectric converter (4) was provided on the frame supporting the feed device such as the feed screw. Even if a light source (1) is installed on the pickup arm hook, and a light turtle conversion kite is installed on the pick-up ring hook, in the case of J I was kicked by wl.

In addition, in devices other than this embodiment, the conventional poten VM
Even in a device that uses a computer, a linear encoder, or a rotary encoder to perform position reading, it is possible to put it to practical use as an output screen by taking accuracy into consideration.

As explained above, according to Honsharo's disc playback system,
Regardless of the type of endogenous method, it is composed of simple light and photoelectric conversion elements, is non-contact, has a long life, and has high reliability.
You can get the lowest IIT ratio.

[Brief explanation of drawings]

tiir] eu(a)(b> is the front view and top view of the mounting part of one embodiment of the present invention, fat! figure is the plan view of another fruit 11is @ 1 set of 8 figures is based on the implementation of l11- Disc ^ A depiction of the desire of a living turtle - (1)...Hikari 111. See 1...V Rindorikaμ Lenme [
optical element), (31... movable table, (4) (7)
・・Photoelectric conversion element, (・) ・・Half mirror-1 (9)
...Division circuit, oQ...disk, (Il-...turntable motor, (2)...times k [ti device, @...
... Increased balance 11 (2) ... Feed screw, II ... Feed motor agent Yoshihiro Morimoto Figure 1 Figure 2 School

Claims (1)

[Claims] 1. A turntable motor that drives a disc-shaped recording medium in a negative direction, a pickup device that reads information on the recording medium, and a feed kiik that drives the pickup device in the radial direction of the recording medium. A light source and an optical element for converging or diverging the light beam from the light source are provided on one of the frame supporting the self & I recording device and the pickup device, and on the other. A photoelectric conversion element is provided that collects and receives the luminous flux emitted through the optical element, and the output voltage ratio of the photoelectric conversion element is set to a voltage or a turn tape A according to the above-mentioned feeding device.
/4-Disk aging device with one reference voltage ratio in the evening. 2. Of the frame that supports the sending device and the pickup device, there is a spectroscopic element that extracts a part of the luminous flux of the 11th light, and a light beam that converts the output of the spectroscopic condenser 1 into a voltage. m element is provided, and the output of the photoelectric & llI4 elements provided on the other side is removed by the output of the photoelectric conversion element provided on the other side, and the output voltage ratio after this correction is 1. 1. The disk 6 production device as set forth in claim 1, wherein the rotation feed device is controlled by a single turn control 41 and a quasi-voltage.