JPH0579742U - Disk player turntable positioning device - Google Patents

Abstract

(57) [Summary] [Object] To provide a turntable positioning device for accurately setting the positional relationship between a disc and an optical pickup for reading a signal from the disc. A positioning hole 20 is formed in a fixed substrate 10 to which guide shafts 8 and 9 for guiding the movement of an optical pickup are fixed, and a projection for supporting a bearing of a rotary shaft 2 of an electric motor 1 is formed in the positioning hole 20. The part 3 is fitted and the turntable 4 is positioned.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disc player, and more particularly, to a positioning device for a turntable on which a disc is placed.

[0002]

[Prior Art]

 Optical disc players that use an optical pickup to optically read a signal recorded on a disc and write a signal to the disc are widely used. It is equipped with a turntable that is placed and rotates the disc at high speed.

As a typical optical disc player, a CD player is well known. Among such CD players, a headphone stereo type that is configured to listen to a reproduced sound through headphones is used. There is a portable CD player.

[0004]

[Problems to be solved by the device]

 Since the portable CD player is used while being carried, it is susceptible to vibration and it is necessary to make the relationship between the position of the optical pickup and the position of the disc accurate. The present invention has been made in view of these points.

[0005]

[Means for Solving the Problems]

 The turntable positioning device of the present invention includes an optical pickup movably mounted, a guide shaft for guiding the movement of the optical pickup, and a guide shaft mounting piece to which the guide shaft is mounted and fixed, and an electric motor. A fixed base plate to which is mounted and fixed; a protrusion that is formed on the lower surface of the electric motor and supports a bearing of a rotary shaft on which a turntable is press-fitted; and a protrusion that is formed on the fixed base plate. It is composed of a positioning hole into which is fitted.

[0006]

[Action]

 According to the present invention, the position of the optical pickup and the position of the optical pickup are formed by forming a positioning hole into which a protrusion provided to support the bearing of the electric motor fits in a fixed base plate to which a guide shaft for guiding the optical pickup is mounted. The relationship with the position can be set accurately.

[0007]

【Example】

 FIG. 1 is a cross-sectional view of a main part of a turntable positioning device according to the present invention. In the figure, reference numeral 1 is an electric motor for rotationally driving a disk D, which is provided with a rotating shaft 2 protruding upward, and a protruding portion 3 for supporting a bearing (not shown) of the rotating shaft 2 is formed on a lower surface thereof. ing. A turntable 4 is press-fitted into the rotary shaft 2 so as to be driven to rotate by the electric motor 1. It is configured. Reference numeral 7 denotes a ball bearing which is provided in the holding portion 6 and is urged outward by a spring (not shown) about the rotary shaft 2, and the disk D is placed on the turntable 4 on the mounting portion. 5 has the function of being pressed and placed.

Reference numerals 8 and 9 denote guide shafts on which an optical pickup (not shown) for reading a signal from the signal surface of the disk D is movably attached and guide the movement of the optical pickup, which are formed on the fixed substrate 10. It is supported and fixed by the guide shaft mounting pieces 11 and 12.

Reference numeral 13 denotes an electric motor fixing member for attaching and fixing the electric motor 1 to the fixed substrate 10. The electric motor fixing member 13 is fixed to the upper surface of the electric motor 1 with screws 14 and 15, and is a cylinder for covering the electric motor 1. It is molded into a shape. Reference numerals 16 and 17 denote attachment portions integrally formed with the electric motor fixing member 13, and are configured to be fixed to the fixing base plate 10 with screws 18 and 19.

Reference numeral 20 is a positioning hole formed on the fixed substrate 10 and into which the protrusion 3 formed on the lower surface of the electric motor 1 is fitted. This serves to determine the position of the table 4. Further, the positioning hole 20 is configured so that the projecting portion 3 does not project below the fixed substrate 10 by deforming the fixed substrate 10 upward.

Reference numeral 21 is a protrusion formed on the upper surface of the electric motor 1, and is provided to support a bearing (not shown) that pivotally supports the rotary shaft 2. Reference numeral 22 is a hole formed in the electric motor fixing member 13, and is configured so that the protruding portion 21 of the electric motor 1 is inserted.

In the apparatus configured as described above, the electric motor 1 is fixed to the electric motor fixing member 13 by the screws 14 and 15, and then the electric motor fixing member 13 is attached to the fixed substrate 10 by the screws 18 and 19. Thus, it is mounted and fixed on the fixed substrate 10. When the electric motor 1 is attached and fixed to the fixed substrate 10, the protrusion 3 formed on the lower surface of the electric motor 1 is fitted into the positioning hole 20 formed on the fixed substrate 10. It becomes a state. Therefore, the positioning of the rotary shaft 2 of the electric motor 1 is performed by the positioning hole 20.

On the other hand, the optical pickup for reading a signal from the disc D is mounted so as to move while being guided by the guide shafts 8 and 9 supported and fixed by the guide shaft mounting pieces 11 and 12 formed on the fixed substrate 10. Therefore, the positional relationship between the optical pickup and the rotary shaft 2 can be made accurate. Therefore, the positional relationship between the turntable 4 which is press-fitted and fixed to the rotary shaft 2 and the optical pickup can be made accurate, and the positional relationship between the disc D on which the turntable 4 is mounted and the optical pickup is accurate. Can be accurate. Therefore, the reading operation of the signal recorded on the disk D by the optical pickup can be accurately performed.

[0014]

[Effect of the device]

 According to the present invention, the fixed base plate, to which the guide shaft for guiding the optical pickup is attached, has the positioning hole into which the protrusion provided to support the bearing of the electric motor fits. Therefore, the rotary shaft to which the turntable is attached is formed. The positional relationship between the optical pickup and the optical pickup, that is, the positional relationship between the disc and the optical pickup can be set accurately. Therefore, the reading operation of the signal recorded on the disc by the optical pickup can be accurately performed, and the present invention has a very great effect when applied to a portable disc player.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a turntable positioning device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor 2 Rotating shaft 3 Projection 4 Turntable 8 and 9 Guide shaft 10 Fixed substrate 11 and 12 Guide shaft mounting piece 13 Motor fixing member 20 Positioning hole D disk

Claims (1)

[Scope of utility model registration request] 1. A disc player provided with a turntable in which a disc is placed and which is press-fitted into a rotating shaft of an electric motor, and a guide shaft to which an optical pickup is movably mounted and which guides the movement of the optical pickup. A fixed base plate on which a guide shaft mounting piece to which the guide shaft is mounted and fixed is formed and on which the electric motor is mounted and fixed, and a protruding portion which is formed on a lower surface of the electric motor and supports a bearing of the rotating shaft. A turntable positioning device for a disk player, comprising a positioning hole formed in the fixed substrate and into which a protrusion of the electric motor is fitted.