JPH042404Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a linear tracking type record player.

Conventionally, record players have used a linear arm system in which the pick-up arm is moved in parallel as a means of improving the distortion of the reproduced sound due to the tracking error angle of the pick-up arm. To achieve this goal, there are proposals to attach the arm drive unit to the lid of the player to make it more compact, or to install the arm drive unit inside the cabinet so that the arm bends out from under the cabinet panel. .

However, in the former case, when the lid is open, the pickup is also raised at the same time, making it impossible to play the record, making it difficult to adjust the stylus pressure and the position of the stylus on the groove introduction part, resulting in high costs.
In addition, even with the latter, it is difficult to adjust the position, and the armrest must be placed on the outside of the record in order to change records, which limits how compact it can be.
The arm also has a special shape, resulting in high costs and the disadvantages of having to remove the panel for repairs.

An object of the present invention is to solve the above-mentioned drawbacks with a simple configuration and to propose a compact record player.

The feature of this invention is that a bridge part is rotatably provided on the panel of the record player, and a slider supporting a pick-up holder having a pick-up is slidably provided on the bridge part, and the rest position of the pick-up and the lowering of the pick-up are adjusted. The reason lies in matching the position.

The present invention will be explained below with reference to illustrated embodiments. 1st
In figure 3, the record player is panel 10.
A turntable 12 on which a record disc 11 is placed is rotatably provided, and the bent bases of a pair of left and right support parts 1 and 2 on the negative side panel 10 of the turntable are fixed with screws 13. . A support shaft 14 is fixed to the upper side of one support part 1, a rotation shaft 15 is rotatably provided to the other support part 2, and the bridge part 3 is rotatably supported between both support parts. Bridge section 3
Pick-up arm 1 which is a pick-up holding body
The slider 4 to which the slider 6 is attached is slidably held by a guide shaft 5, and the pick-up arm 16 is laterally fed by a pulse motor 17, a thread reel 18, a pulley 19, and a thread 20.

As shown in FIGS. 4 to 6, the bridge portion 3 has bent portions 3a, 3b and a bifurcated engaging portion 3 at both ends in the longitudinal direction.
c is provided, and through holes are bored in the bent portions 3a and 3b, respectively, into which the support shaft 14 and the rotation shaft 15 are fitted,
The guide shaft 5 is fixed to the bent portion 3b and a small bent portion 3d formed downward toward the bent portion 3a on the upper surface of the bridge portion 3.

2, 3, and 5 are shown on the outside of the support portion 2.
As shown in the figure, a gearbox 6 is provided, and a gear within the gearbox is rotated by a pulse motor 21 fixed inside as shown in FIG. One end of a pin 22 is fixed to the rotation shaft 15, and the other end is inserted between the two crotches of the engaging portion 3c, so that the bridge portion 3 is rotated by a pulse motor 21. The pulse motor 21 is rotated by a pulse signal sent from a pulse generator 25 via a control circuit 23 and a decoder 24 shown in FIG.

The ejection position of the bridge section 3 is shown in FIGS. 4 and 5.
In the figure, the up position of the pick-up arm 16 is shown as the one-dot chain line, and when the arm is lowered onto the record 11, the bridge section 3 is rotated to the horizontal solid line position.

On the back side of the bridge section 3, there is a sixth section consisting of a switch.
As shown in the figure, a reference position control member 26 is provided which corresponds to the auto-in position of a 30 cm record and controls the lateral feed reference position of the slider 4 at the rest position.

A holding member 27 is fixed to the lower left end of the slider 4 in FIG. 3 with three screw holes 4a and a screw (not shown), and the holding member holds the pick-up arm 16 in a gimbal manner so that it can freely rotate vertically and horizontally. The chevron-shaped protrusion 28 fixed to the pick-up arm is engaged with the V-groove 7a of the movable top 7 provided on the slider 4 except during performance, thereby restricting the movement of the pick-up arm in the swinging direction. The position of the needle tip is adjusted using the screw 7b of the top 7.
At the bottom of the slider 4 in Fig. 3 is an optical detection member 8.
A shielding plate 29 fixed to the pick-up arm 16 is formed so as to enter between the light source 8a and the sensor 8b of the optical detection member 8.
The error angle of the pick-up arm detected by the sensor 8b is determined by the control circuit 23 and decoder 3 shown in FIG.
The pulse motor 17 is rotated by the pulse generator 25 via the rotation angle 0, and the error angle is corrected by horizontally feeding the slider 4 with this rotation.

From the pulse generator 25 to the pulse motor 1
The number of pulses sent to 7 and 21 is counter 3, respectively.
It is counted and controlled by 1 and 32. The control circuit 23 includes a size setting switch 3 for the record 11.
3 is connected.

The operation of the record player configured as described above is initially such that the bridge section 3 is in the eject position indicated by the two-dot chain line in FIGS. 11 is loaded and the record size setting switch 33 shown in Fig. 7 is set, it is turned on.
Off switch 34 is turned on. When the switch 34 is turned on, the turntable 12 is rotated, and pulses are sent from the pulse generator 25 to the pulse motors 17 and 21 to rotate them. The bridge part 3 is rotated by the rotation of the pulse motor 21, and the fourth
The pick-up 35 is attached to the tip of the pick-up arm 16 in the solid line position in FIG.
The tip of the stylus is placed in the groove introduction part of the record, and the player is ready to play.

When the size of the record 11 is 17 cm, when set with the size setting switch 33, it is turned on.
When the off switch 34 is turned on, the bridge section 3 is rotated to the position indicated by the dashed line in FIGS. The cumulative value of the number of pulses sent to 17 and the preset value are compared in control circuit 23, and pulses are sent until they match. When the slider 4 is moved horizontally and reaches the auto-in position for a 17cm record, the horizontal feed necessary for auto-in is stopped, and the pulse motor 2
A pulse is sent to point 1, the needle is lowered onto the record, and it is ready to play. A current for maintaining the lowered position is supplied to the pulse motor 21 during the performance, so that the lowered state of the pickup arm is maintained.

The end of the performance is detected by the pulse motor 17.
It is detected when the cumulative value of the number of pulses sent to matches the end preset value, and the pulse motor 21
The number of pulses necessary for the return operation is sent to rotate the bridge section 3 in the reverse direction, and the pick-up arm 1
6 is raised to the up position, and then the slider 4 is reversely rotated to the left in FIG. 1 by the reverse rotation of the pulse motor 17, and the reference position control member 26 is actuated to complete the operation.

Next, when an eject instruction is issued by the switch 36 during the performance, the movement is reversed from the up position to the rest position in the same order as at the end, and stopped at the rest position by the operation of the reference position control member 26. . A predetermined number of pulses necessary for ejecting are sent to the pulse motor 21, and the pick-up arm 16 is raised from the lowered position to the up position and from the up position to the ejected position.

The record disc 11 in the above description may be a sound record or an image record. Furthermore, although it has been described that the needle tip is traced by the groove, the present invention may be utilized by configuring the needle tip to be traced without contact.

Since the present invention is configured as described above, the rest position and the pick-up lowering position are made to match and are controlled by the reference position control member, so that the player is compact in the width direction and the pick-up lowering position can be easily adjusted. A record player with excellent effects can be provided.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a plan view of a record player, FIG. 2 is a plan view of the bridge section and support section, FIG. 3 is a rear view, and FIGS. FIG. 6 is a back view of the bridge section, and FIG. 7 is a control circuit diagram. 1, 2...Support part, 3...Bridge part, 4...Slider, 10...Panel, 11...Record,
12... Turntable, 16... Pick up arm, 17... Pulse motor, 26... Reference position control member, 35... Pick up.

Claims (1)

[Scope of utility model registration request] In a record player of the type in which a pick-up is moved linearly in the direction of the rotation center of a turntable on which a record is placed, a bridge part rotatably provided on a support part provided on a panel of the record player, and a bridge part provided on the support part provided on the panel of the record player, and A slidable slider, attached to this slider,
A pick-up holder for holding the pick-up and a reference position control member provided on the bridge section, and a rest position of the pick-up and a lowering position of the pick-up to the introduction part of the record are controlled by the reference position control member. A record player characterized by matching.