JPS5826103B2 - record player - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a record player, particularly a vertical record player, and relates to a record player that presses a record onto a turntable and has a clamper with a built-in record detecting element essential for automatic performance. .

The vertical record player will be explained below.

Due to its structure, a vertical record player requires some kind of means to press the record onto the turntable.

For this reason, conventionally, as shown in FIG.
The method used was to press the record 14 into place.

With this method, the record was not sufficiently pressed against the turntable, and the mounting state was unstable.

In addition, a clamper (not shown) of a chuck mechanism, for example, which is sufficiently crimped, must be prevented from rotating on the center spindle, which has the disadvantage that it takes time and effort to mount a record.

On the other hand, when it comes to record detection, which is essential for automatic performance,
Conventionally, as shown in FIG. 2, the main method has been to transmit light, and the light from the irradiation lamp 10 is passed through a reflector 18 to a light-receiving reflector attached to a position corresponding to the diameter of the record on the turntable 19. -20, and then irradiates the light receiving sensor 11. Depending on the size of the record, the light is irradiated or cut off to the sensor, and a control signal is extracted.

This type of system has many disadvantages, such as having multiple reflectors in the light path, causing a lot of light loss, requiring high mounting precision, and having a large number of parts. However, it also had drawbacks such as malfunction.

This invention aims to eliminate the drawbacks of the conventional system by integrating the function of pressing the record onto the turntable and detecting the diameter of the record.One embodiment will be described below with reference to the drawings.

In Fig. 3, 1 is a fixed foot fixed to a base 2;
4 is a movable arm, and 4 is a fixed foot 1 that allows the movable arm 3 to rotate.
5 is a record presser, 6 and 7 are bearings for the record presser installed on the movable arm 3, and 8 is a ring to prevent the record presser 5 from being removed.

Reference numeral 9 denotes a compression spring that applies a compression force to the movable arm 3 in the direction of the base.

10 is an irradiation lamp, 11 is a light receiving sensor, 12 is a condensing lens that focuses the light of the irradiation lamp 10 onto the record surface,
13 is a reflected light intake window.

In a record player having a clamper having the above-mentioned five configurations, to mount a record, the movable arm 3 is first rotated in the direction of the arrow in FIG. 3 about the hinge 4 as a fulcrum.

In this case, the movable arm can be stopped at a position where the compression spring 9, which moves together with the movable arm 3, passes through the center of rotation of the hinge 4.

Next, the record 14 is mounted on the rubber sheet 16 on the turntable via the center spindle 15, and the movable arm 3 is rotated again to bring it into the state shown in FIG.

The record presser 5 is mounted on a bearing 6 provided on the movable arm 3.
7 allows for smooth rotation, and its center of rotation is located at a position that coincides with the center of the center spindle 15, and the contact surface with the record is connected to the donut adapter (not shown) and the center spindle 15. It is concave to fit.

For this reason, the record presser 5 tightly engages the center spindle, and presses the record 14 onto the turntable by the compression spring 9, rotating smoothly with the rotation of the turntable.

On the other hand, the record disc diameter detection element is composed of a combination of an irradiation lamp 10 and a light receiving sensor 11, so that the light transmitted through the condenser lens 12 is focused on the surface of the record disc 14, and the reflected light reaches the light receiving sensor 11. It is installed inside the movable arm 3 at a position corresponding to the diameter of the record disc.

A control signal can be extracted from the detection element thus installed based on the difference between the light reflected from the record and the light reflected from the rubber sheet 16 on the turntable.

This reflection method has the advantage of being able to fully demonstrate its function since it can detect reflections from grooves even on record discs that transmit light.

Further, FIG. 4 is a perspective view showing an embodiment of the clamper according to the present invention.

As mentioned above, since the record clamper device according to the present invention is fixed to the base of the record player,
The record can be attached and detached easily and reliably, and at the same time as the record is pressed onto the turntable, the movable arm is set at a constant height in the radial direction above the record, so detection accuracy within the movable arm is improved. It has the advantage of being able to integrate a reflective plate diameter detection element with high efficiencies, and that highly accurate control signals can be obtained with an extremely simple structure.

[Brief explanation of drawings]

Fig. 1 is a partially omitted sectional view showing a conventional clamper;
FIG. 3 is a partially cutaway sectional view showing a conventional record diameter detection mechanism, FIG. 3 is a partially cutaway sectional view showing a clamper device integrated with a record diameter detection element according to the present invention, and FIG.
The figure is a perspective view showing an embodiment of the clamper device according to the present invention. The same symbols in the figures indicate the same or equivalent parts.
1 is a fixed foot of the clamper, 2 is a base, 3 is a movable arm, 4 is a hinge part, 5 is a record holder, 10 is a light emitting element, 11 is a light receiving sensor 12 is a condensing lens, 13 is a window, 1
4 is a record disc, 15 is a center spindle, 16 is a rubber sheet, and 19 is a turntable.

Claims (1)

[Claims] 1. In a record player equipped with a clamper that presses a record disc onto a turntable and a disc diameter detection element that detects the disc diameter of the record disc, the clamper is connected via a hinge to a fixed foot fixed to the base of the record player. The disc diameter detecting element is provided on the movable arm and emits light. A record player comprising a light emitting element and a light receiving element provided on the movable arm and receiving light reflected from the light emitting element by a record disc or a turntable.