JPH0629778Y2 - Optical pickup position detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention detects a signal by an optical pickup for a CD that reads information on a recording disk, inputs the signal, and picks up the pickup at a desired position. The present invention relates to an optical pickup position detecting device to be set.

<Prior Art> Conventionally, as shown in FIG. 5, a position detecting device for a pickup of this type is configured such that a sliding piece (22a) of a potentiometer (22) arranged outside the pickup (21) is attached to the pickup (21). Directly connected and attached, for example, the potentiometer (2
By connecting the resistance part of 2) to the resistance side of the bridge circuit of the position detection circuit (23) and connecting the resistance value between the sliding piece (22a) and one end of the resistance part and the resistance value of the entire resistance part. The potential change of the potentiometer (22) is detected from the ratio and the pickup (2
There is a potentiometer direct method that sets the position of 1).

<Problems to be solved by the invention> Therefore, since the conventional position detecting device of this type is as described above, it requires a large number of highly accurate parts and requires a high degree of precision when assembled as a detecting device. Therefore, there is a problem that it causes an increase in cost.

Therefore, in order to solve such a conventional problem, the present invention contacts the outer surface of the guide shaft for driving the pickup and the outer surface of the guide shaft, which is attached at an angle, while sliding the contact shaft. A variable resistor with a lever that changes
An object of the present invention is to provide an optical pickup position detection device attached to the side surface of a pickup.

<Means for Solving the Problems> The structure of the present invention for achieving the object will be described with reference to FIGS. 1 to 4 corresponding to the embodiments.
In the horizontal position, one end (3a) is in pressure contact with the outer surface of the guide shaft (3) attached while holding the angle (θ) with the moving direction of the pickup (1), and the rotation angle while sliding Variable resistor with rotating lever (4a) whose (α) changes
The optical pickup position detecting device has a configuration in which (4) is attached to the side surface of the pickup (1).

<Operation> Since the present invention has such a structure, the rotary lever (4a) of the variable resistor (4) attached to the side surface of the pickup (1) is attached while keeping the angle. Guide shaft
Since it moves with the pickup (1) while contacting (3), the degree of deviation of the guide shaft (3) depends on the rotation lever (4a).
Proportional to the angle of. Therefore, the resistance value of the variable resistor (4) is measured by the electric detection circuit (5) connected to the outside, and the value is input to another position detection circuit (5 ') to pick up.
The position of (1) can be specified.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings.

1 to 4 are views showing an embodiment of the present invention, in which (2) is a guide shaft for driving an optical pickup (1) to control movement, ) Is a guide shaft on which a rotary lever (4a) mounted on the rotary shaft of a variable resistor (4) mounted on the side surface of the pickup (1) moves while contacting its contact portion (6).

One end (3a) of the guide shaft (3) is attached while holding an angle (θ) with the moving direction of the pickup (1), and moves in a long groove (8) provided in the pickup (1). Rotating lever of the variable resistor (4) attached to the side of the pickup (1)
While (4a) slides in contact with the guide shaft (3), the pickup
Move with (1). For example, when one end (3a) of the guide shaft (3) is offset to the outside by an angle (θ), as shown in FIG. 2, the pickup (1) has a gap between both guide shafts (2) and (3). When in the narrow position, the guide shaft (3) is
Since it is located at the back in (8), the angle of the turning lever (4a) becomes small, and when the angle (θ) is at a large position, the guide shaft has a long groove (8) as shown in FIG. ), The angle of the turning lever (4a) becomes large. And
It is possible to measure the resistance value of the variable resistor (4) by an external electric detection circuit (5) and input that value to another position detection circuit (5 ') to detect the position of the pickup (1). it can.

(7) is an objective lens for the laser beam.

Although the embodiments considered to be typical of the present invention have been described above, the present invention is not necessarily limited to only the structures of these embodiments, and the constitutional requirements referred to in the present invention and the purpose referred to in the present invention can be obtained. The present invention can be carried out with appropriate modifications within the scope of achieving the following effects.

<Effects of the Invention> As is apparent from the above description, the present invention is to detect the electric resistance value in the guide shaft, the rotating lever of the variable resistor of the pickup and the contact portion with the electric detection circuit having a simple structure. The position of the pickup can be detected by easily and accurately measuring the lever angle. And
The lead-in portion of a desired music piece of a disc, such as when the music piece is changed, can be obtained at a low cost, and a device capable of quickly setting the pickup can be expected to have a remarkable practical effect.

[Brief description of drawings]

1 to 4 are explanatory views showing an embodiment of the present invention.
FIG. 1 is a three-dimensional view of the essential part of the present invention, FIG. 2 is a plan view, FIGS. 3 and 4 are side views showing the relative positions of the pickup, guide shaft and lever, and FIG. FIG. In the figure, (1) is an optical pickup, (2) and (3) are guide shafts, (3a) is one end of the guide shaft (3), and (4) is a variable resistor.
(4a) is a rotary lever, (5) is an electric detection circuit, and (6) is a contact portion.

Claims (1)

[Scope of utility model registration request] 1. In a horizontal posture, one end (3a) contacts the outer surface of a guide shaft (3) mounted while holding an angle (θ) with the moving direction of the pickup (1) and rotates while sliding. Variable resistor with rotating lever (4a) whose moving angle (α) changes
An optical pickup position detection device in which (4) is attached to the side surface of the pickup (1).