JPH09213032A - Portable disk reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a resumed play without consuming a battery and without providing a dedicated switch, by providing a means for detecting a moving amt. of a pickup of the reproducing device driven by the battery from its stopping position to the innermost circumferential position. SOLUTION: A lead screw 2 is rotated by a motor 3 in rotary motion by the battery via a reduction gear 4 to move the pickup 1. A shutter 5 is arranged coaxially with the screw 2 to detect the rotation of the screw 2. When a power source is turned on, the pickup 1 is moved to the innermost circumferential position to read TOC information of a disk, whereas the number of opening and closing times of the shutter 5 is counted up by a photointerruptor 6, and the number of pulses is stored by pressing a switch 7. The pickup 1 is fed by this stored amt., and is focused to read a signal, and from its subcode, the position of the pickup 1 is detected to perform reproduction with time displayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable disc reproducing apparatus, and more particularly, it uses a resume play function as a mechanical memory for the position of a pickup when a performance is stopped without electric backup until a TOC switch is pushed. The present invention relates to a configuration having a detection means for detecting the movement amount of the.

[0002]

2. Description of the Related Art FIG. 4 is a perspective view showing a main part of a pickup feed mechanism in a conventional portable CD player, and the pickup 21 is driven by a screw feed mechanism by a lead screw 22. In the figure, 23 is a battery-driven motor, and 24 is a reduction gear group.

[0003]

DISCLOSURE OF THE INVENTION Conventional portable CD
In the player, the resume play has a dedicated switch, and the backup is performed by the microcomputer only when the switch is on, and apparently the micro current continues to flow to the microcomputer even when the power is off. Therefore, if the resume switch is left ON, the battery is consumed, and the operating time of the player is shortened. For that reason, the switch is provided.

It is an object of the present invention to provide a portable disc reproducing apparatus provided with a mechanism that enables a resume play without consuming a battery and without providing a dedicated switch.

[0005]

The portable disk reproducing apparatus of the present invention is a battery-driven portable disk reproducing apparatus provided with detection means for detecting the amount of movement of the pickup from the stop position to the innermost peripheral position. Is.

In this case, in a portable CD player in which a screw feed mechanism using a lead screw is arranged in the feed mechanism of the pickup, the movement amount of the pickup is detected by detecting the number of rotations of the lead screw. As a pinion
When a gear train including a rack is arranged, the number of rotations of the gear is detected.

For example, a shutter is provided coaxially with the lead screw, or a fan-shaped shutter window is formed on the gear or a reflection sheet is attached, and the rotation speed of the lead screw or the gear is detected by a photo interrupter. . The output of the photo interrupter is supplied to the microcomputer.

[0008]

1 shows an embodiment of a portable disc reproducing apparatus according to the present invention. FIG. 1 shows a portable CD player in which a feed mechanism of a pickup 1 uses a screw feed mechanism with a lead screw 2 and a battery. The lead screw 2 is rotated by the motor 3 that is rotationally driven through the reduction gear 4, and the pickup 1 is sent.

A shutter 5 is provided coaxially with the lead screw 2, and a photo interrupter 6 is arranged so as to sandwich the shutter 5 so that the rotation of the lead screw 2 can be detected. The output of the fore interrupter 6 is supplied to the microcomputer. 7 is a TOC switch.

[0010]

In the embodiment of FIG. 1, when turned off during reproduction,
When the OFF key is pressed, the pickup 1 is stopped and the power is turned off. This operation is similar to the conventional one. Next, when the power is turned on, the pickup 1 moves to the innermost position and reads the TOC information on the disc. At this time, the photo interrupter 6 counts the number of times the shutter 5 is opened and closed, and the TOC switch 7 is turned on. Press to end and memorize the number of pulses.

After reading the TOC information, the pickup 1 is sent by the amount of the memorized pulses, and the focus is applied.
Read the signal and pick up from the subcode 1
The position is detected, the time is displayed, and playback is started.

Resume play becomes possible through this process. However, unlike the electric backup, it cannot be restarted from the exact same location, and it will be restarted from the vicinity. Therefore, it is possible to utilize the disc medium to reproduce from the head of the track read by the subcode.

[0013]

FIG. 2 is a second embodiment of the present invention. In the embodiment of FIG. 1, the rotation of the lead screw 2 is detected by the photo interrupter 6, but in the embodiment of FIG. Pinion rack 11 for 1 feed mechanism
A gear train 12 including a fan-shaped window 13
It is a format in which a is formed and is sandwiched by the photo interrupter 6. FIG. 3 shows an example of the window patterns of the shutter 5 and the gear 13.

A fan-shaped reflection sheet may be attached to the gear 13 and the reflected light may be detected by the photo reflector 6, or other rotation detection means may be adopted.

[0015]

EFFECTS OF THE INVENTION According to the portable disk reproducing apparatus of the present invention, (1) the reproducing time is not shortened because the battery is a mechanical memory even if the apparatus is left for a long time. (2) Since it has nothing to do with battery consumption, a switch dedicated to resume play is not required. (3) Even if the battery is replaced, it is only necessary to count the pulses from the pickup position at that time to the TOC switch, so that resume play is possible.

[Brief description of drawings]

FIG. 1 is a perspective view of essential parts showing an embodiment of a portable disc reproducing apparatus of the present invention.

FIG. 2 is a perspective view showing another embodiment.

FIG. 3 is a front view showing an example of patterns of shutter and gear windows.

FIG. 4 is a perspective view showing a pickup feeding mechanism of a conventional portable CD player.

[Explanation of symbols]

 1 Pickup 2 Lead Screw 3 Motor 4 Reduction Gear 5 Shutter 6 Photointerrupter 7 TOC Switch 11 Pinion Rack 12 Gear Row 13 Gear 13a Window

Claims (3)

[Claims] 1. A portable disk reproducing apparatus driven by a battery, comprising detection means for detecting the amount of movement of the pickup from the stop position to the innermost peripheral position. 2. The portable disk reproducing apparatus has a pick-up field mechanism in which a screw feed mechanism by a lead screw is arranged, and the detecting means is configured to detect the rotational speed of the lead screw. 1. The portable disk reproducing device according to 1. 3. The portable disc reproducing apparatus according to claim 1, wherein a gear train including a pinion rack is arranged as a pickup feeding mechanism, and the detecting means is configured to detect the number of rotations of the gear.