JPH0132162Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a position detection mechanism for a linear tracking player, and an object of the present invention is to provide a highly accurate position detection mechanism with a simple configuration and at low cost.

Conventionally, in an electronically controlled linear tracking player using a microprocessor, multiple pairs of light receiving and emitting elements are used to control the position of the pickup arm according to each size of the record, and each of the light receiving and emitting elements In between, a light-shielding plate with slits was inserted, and the pulses generated by the light-receiving and emitting elements were input to a microprocessor to control the drive system. Therefore, the conventional structure has been complicated and the manufacturing cost has been high.

In view of these conventional problems, the present invention has a single light-receiving element that follows the linear movement of the pick-up arm, a guide groove for inserting a sliding pin provided on the support frame side of the pick-up arm, and a guide groove for inserting each of the records. Using a fixed light emitting unit that integrates a housing with light emitting elements arranged at introduction and extraction positions according to size, each position is input to the microprocessor using pulses from the light receiving unit to control the position of the pick-up arm. That is.

The present invention will be described below with reference to the illustrated embodiments. In FIGS. 1 to 3, 1 is a player body, 2 is a rotating shaft, 3 is a turntable, and 4 is a record disc. 5 is a pick-up arm, and a cartridge stylus 7 is attached to the tip of the pick-up arm through a holder 6.
A balance weight 9 having a rod-shaped projection 8 is provided on the base side, and this pick-up arm 5 is pivoted via a pivot 10 to a support arm 12 of a pedestal 11 so as to be able to swing vertically. There is.
The frame 10 is box-shaped and has a pick-up arm 5.
It has a built-in elevating device 13 for slowly elevating and lowering the player, and is attached to the player main body 1 via a support frame 14 so as to be movable in a straight line. The lifting device 13 consists of an outer magnetic frame 15, a solenoid 16, a piston holder 17, a piston 18, a plunger 19, an inner spring 20, an outer spring 21, a connector 22, etc. When the solenoid 16 is energized, the compressed force of the inner spring 20 The pick-up arm 5 is gradually and gently lowered via the piston 18, the connector 22, and the rod-like projection 8, and when the current is cut off, the pick-up arm 5 is gradually raised by the compressed force of the outer spring 21.

The support frame 14 has a sliding portion 23 and a guide rail 25 attached to the main board 24 of the player body 1.
It can be moved linearly along a rope 26 by a drive device (not shown). 27 is the support frame 14
This sliding light receiving part 27 is attached to the sliding light receiving part 27.
The housing 2 has a minute opening 28 formed therein.
9 is provided, and a sliding pin 30 is integrally provided to protrude. A light receiving element 32 attached to a substrate 31 is housed within the housing 29 . 33 is a board on which light emitting elements 34a, 34b, 34c, . . . are mounted. Reference numeral 35 denotes a fixed light emitting section, which includes light receiving element housing sections 36a, 36b, 36c, .
a guide groove 3 into which the sliding pin 30 is slidably fitted;
7, each housing portion 36a, 36
b, 36c..., each light receiving element 34a, 34b, 3
The board 33 is attached so that the parts 4c, . . . are accommodated therein. Furthermore, the fixed light emitting section 35 is attached to the mounting section 38.
A hole 40 into which the large-diameter head of the eccentric pin 39 of the main board 24 fits is formed at one end in the longitudinal direction, and an elastic member 41 is formed at the other part of the mounting part 38.
Screws 42a, 41b, 41c are interposed therebetween, respectively.
It is attached to the main board 24 by 42b and 42c.

As shown in FIG.
Each of the light emitting elements 34a, 34b at the introduction position of the record disc and the lead-out position (not shown) of the LP/EP record disc,
34c... are arranged at predetermined intervals, and the substrate 3
It is installed on 3.

These intervals are determined by various standards and do not change from record to record. but,
The position from the center of the record 4 to the sliding light-receiving part 27 will vary slightly in each set due to assembly errors. It is necessary to make slight changes in The eccentric pin 39 makes this possible. That is, the eccentric pin 39
As shown in the figures and FIG.
It is rotatably attached to the main board 24 so as to face the hole 42a' formed in the panel 42, and furthermore, a lower end of the shaft 39a is provided with a Slightly eccentric and shaft portion 39
A circular head having a diameter larger than a is integrally formed, and this circular head is fitted into a hole 40 formed in the mounting portion 38.

Therefore, when adjusting the fixed light emitting part 35, insert a screwdriver through the hole 42a' of this panel 42, engage it with the cut groove 39b, and rotate the eccentric pin 39 around the shaft part 39a to adjust the eccentricity. The fixed light emitting section 35 moves in parallel with the guide rail 25 according to the amount of eccentricity of the pin 39, slightly displacing the entire fixed light emitting section 35,
Highly accurate position detection and control can be performed.

Note that the output signal of the light receiving element 29 is sent to a microprocessor and used to control the driving device.

According to the present invention, the sliding light-receiving section is provided on the support frame and one light-receiving element is driven by the linear movement of the pickup coil, so the structure is simple.
In addition to simplifying the structure, this light-receiving element moves between the installation positions of multiple light-emitting elements arranged corresponding to the introduction and extraction positions of each record size, so it can be replaced with a single expensive light-receiving element. , it is only necessary to have as many light-emitting elements as necessary to determine the position, and it can be implemented at an extremely low cost. Further, since the housing of the light receiving element and the sliding pin are integrated to form a sliding light receiving part, and the housing of the light emitting element and the guide groove are integrated to form a fixed light emitting part, the overall structure can be made compact. Further, in order to finely adjust the position of the fixed light emitting part, the shaft part of an eccentric pin is rotatably attached to the main board of the fixed light emitting part, and the eccentric pin is formed on the mounting part of the fixed light emitting part. Fit it into the hole,
Furthermore, since the mounting part is attached to the main board with screws through the elastic member, when the eccentric pin is rotated to slightly displace the mounting part of the fixed light emitting part with respect to the main board, the elastic member is elastically deformed in the direction along the attachment portion, and the deformation of this elastic member absorbs minute distortions at the threaded portion between the screw and the attachment portion due to displacement of the attachment portion. Therefore, the position of the fixed light emitting section after assembly can be adjusted extremely easily and without any trouble by simply rotating the eccentric pin.

[Brief explanation of the drawing]

The drawing shows one embodiment of the mechanism of the present invention.
2 is a side sectional view, FIG. 3 is a perspective view, FIG. 4 is a perspective view of an eccentric pin, and FIG. 5 is a side sectional view showing how the eccentric pin is attached. 1 is the player body, 5 is the pick-up arm,
11 is a frame, 23 is a lifting device, 14 is a support frame,
24 is the main board, 25 is a guide rail, 27 is a sliding light receiving section, 29 is a housing, 30 is a sliding pin, 3
2 is a light receiving element, 34a, 34b, 34c are light emitting elements, 35 is a fixed light emitting part, 36a, 36b, 36c
38 is a housing part, 38 is a mounting part, 39 is an eccentric pin, 39a is a shaft part, 40 is a hole, 41a, 41b,
41c is an elastic member, and 42 is a panel.

Claims (1)

[Scope of utility model registration request] In a linear tracking player in which a support frame supporting a pick-up arm is movable in a straight line along a guide rail attached to the main board of the player body, a sliding mechanism that integrates a housing containing a light emitting element and a sliding pin is used. A light receiving part is provided in the support frame, and a fixed light emitting part is provided which integrally includes a housing part containing a light emitting element corresponding to the introduction and lead out positions of each record size and a guide groove for the sliding pin. A shaft portion of an eccentric pin having a circular head having a larger diameter than the shaft portion and eccentric with respect to the shaft portion integrally formed at one end of the shaft portion is rotatably attached to the substrate, and Fitting the circular head of the eccentric pin into the hole formed in the attachment part of the fixed light emitting part,
Furthermore, the mounting part is attached to the main board with a screw through an elastic member, and the fixed light emitting part is moved a minute distance in a direction parallel to the guide rail by the swing of the circular head caused by the rotation of the shaft part of the eccentric pin. A position detection mechanism for a linear tracking player, characterized in that it is moved.