JPS6224401A - Record player - Google Patents

Abstract

PURPOSE:To eliminate such an action that a tone arm turns with its record stylus dropping by stopping the turn of the tone arm when no ascent of the tone arm is detected by a lift-up detecting means after a fixed period has passed since an ascent command was given to the tone arm. CONSTITUTION:The ascent command is given to a lift-up device, and detected by the lift-up detecting means. If the tone arm does not lift-up during a fixed period, this is considered to be a trouble to stop a turntable. Then the effect is reported and the arm is not moved. Said fixed period must be longer than the time necessary for lifting up the arm. Thus the accident due to the trouble of the turntable can be previously prevented, and the trouble of the lift-up device can be reported by stopping the rotation of the turntable.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a record player having a function of automatically operating a tone arm.

2. Description of the Related Art In conventional record players of this type, before operating the tone arm, the tone arm is raised using electromagnetic or mechanical force and then rotated.

Problems to be Solved by the Invention Generally, in an horde blayer, when lifting up the tone arm to move on to the next operation, if the lift-up device malfunctions, the stylus will remain down on the record, so the stylus and record will be Harass.

SUMMARY OF THE INVENTION An object of the present invention is to provide a record player in which the tone arm does not rotate while the record stylus is down.

Means for Solving the Problems In order to achieve the above object, the present invention includes a tone arm, a lift-up device for raising the tone arm, a lift-up command means for giving a lift command to the tone arm, and a lift-up device for raising the tone arm. and a lift-up detection means for detecting that the tone arm has been lifted, and the rotation of the tone arm is stopped by the output of the lift-up detection means after a certain period of time after a raising command is given to the tone arm.

For production The effects of the present invention using the above means are as follows.

That is, when the lift-up detection means detects that the tone arm has not been raised a certain period of time after a command to raise the tone arm is given, the rotation of the tone arm is stopped.

Embodiments Hereinafter, a record player of the present invention will be explained with reference to drawings of embodiments.

FIG. 1 and FIG. 2 show an embodiment of the record player of the present invention, and in the figures, 1 indicates a main body of the record player;
2 is a record player rotatably attached to the record player body 1 via a hinge 3, a lid body, 4 is a stop button, 5 is a start button, 6 is a cueing button, 7 is a repeat button, and 8 is a power button. , 9 is a program key button group, 1o is a stop operation display element, 1
1 is a start operation display element, 12 is a queuing operation display element, 13 is a repeat operation display element, and 14 is a group of program operation display elements provided corresponding to the program key buttons, respectively. As shown in FIG. 2, the record player body 1 has a turntable 16 mounted on a turntable shaft 15 rotated by a motor (not shown), and the turntable 16 is mounted around the turntable shaft 15. An EP adapter 17 is provided on the upper surface of the EP adapter 16 and is biased by a spring in a direction that always projects.

On the other hand, the record player lid 2 is provided with a linear tone arm device 18, a record disk holding device 19, and a track interval detection device 20 on its inner surface.

As shown in FIG. 3, the linear tone arm device 18 is provided with a support 24 on a movable base 23 that moves on guide rails 21 and 22 arranged opposite to each other, and a pivot shaft bearing 25 is attached to the support 24. The tone arm 26 is supported so as to be freely angularly movable.

A plate 2B having a pointer 27 is protruded from the movable base 23, and the pointer 27 is located on the axis of the tone arm 26 and corresponds to the display window 29 provided on the record player lid 2. There is.

The movable base 23 is equipped with a plunger 3o for vertically moving the tone arm 26, and the plunger 30 is connected to a lift that is opposed to the upper surface of the tone arm 26 via a link mechanism (not shown). It is designed to drive a shaft 31. The moving base 23 is provided with a light receiver 46 and a light emitter 47 facing each other,
The tone arm 2 is connected between the light receiver 46 and the light emitter 47.
A shutter plate 48 provided at 6 is positioned. These light receiver 46, light emitter 47 and shutter plate 4
The signal from the photocoupler 8 is controlled so that when the tone arm 26 swings during the performance of the tone arm 26, the opposing relationship with the movable base 21 maintains a substantially parallel force relationship. used for. A balance weight 49 is attached to one end of the tone arm 26, and a pickup cartridge 5o is attached to the other end. On the other hand, the rotational force of the motor 61 as a drive source for moving the tone arm 26 is generated by passing a belt 55 between a pulley 52 provided on the motor shaft and a pulley 54 provided on the shaft of the worm gear 63. The signal is transmitted to the worm gear 53 and then to the drum 67 coaxial with the gear s6 that meshes with the worm gear 63. The tone arm 26 is moved by connecting a connecting rod 61 provided on the movable base 23 to a rope 6° stretched between the drum 67 and the other pulleys 6B and 59. Further, the tone arm 26 corresponds to the rest switch 62, and is configured to move approximately linearly by the guide rails 21 and 22, and its rest position is 30 f, which is the maximum diameter mounted on the turntable 6.
This corresponds to the performance start position on the FI record disk 42.

Although the specific structure of the record disc holding device 19 is not specified, it is attached to the inner surface of the record player lid 2 with a ball bearing at the center, and also holds the record disc 4 mounted on the turntable 16. is biased by a spring so as to press it against the turntable 16 side.

Then, it is rotated together with the turntable 16. The song interval detection device 2o is connected to the rope 6 as shown in FIG.
o is connected to the record disk 4 by separately provided pulleys 32 and 33.
2, and is attached to the rope eO so as to be adjustable by an adjuster 34. The song interval detection device 2o houses a light emitting element 3e and a light receiving element 37 in a holder 36, and is moved linearly in the radial direction of the record disc 42 by the rope θ0. Therefore, the song interval detection device 20 faces the record disk 42 on the turntable 16 when the record player lid 2 is closed, and the tone arm device 1
8, the light emitted from the light emitting element 36 hits the record dome 42, and the light receiving element 37 receives the reflected light. At this time, the non-recording part of the record disc 42 has a high reflectance of light and a large amount of light enters the light receiving element 37, while in the sound groove part the light is diffusely reflected and the amount of light entering the light receiving element 37 is small. The gap between songs is detected based on the difference in light reflectance between the groove and the groove. and,
The signal from the song interval detection device 2o is processed by a microcomputer serving as a control circuit to control the operation of the tone arm device 18. Further, the record player body 1 is provided on the inner surface of the record player lid body 2.
A switch 38 is provided between the linear tone arm device 18 and the drive circuit of the linear tone arm device 18 when the record player lid 2 is opened while the linear tone arm device 18 is in an operating state. It is used as a stop signal. Although not shown, the tone arm 26 is provided with a switch for detecting that the tone arm 26 itself is down.

Further, a slit disk 41 is provided on the shaft of the worm gear 63 so as to be rotated between a light receiving element 39 and a light emitting element 4o, which are provided facing each other. The signal from the photocoupler made up of the photocoupler 40 and the slit disk 41 is processed by a microcomputer as a control circuit and used to control the position of the tone arm device 18.

FIG. 5 shows an electrical block diagram of the record player of the present invention. In the figure, 71 is a microcomputer as a control circuit, which controls start, stop, cueing, and repeat.

Operation signals from the operation/display section A 2 including program keys and a group of display elements thereof are input, and lighting and blinking signals are output to the display elements corresponding to the operated buttons. The control circuit 71 also includes a record player lid 2.
An open/close detection signal from an open/close detection section (corresponding to the switch 38) 73 that detects the open/close state of the song is input, and a song interval detection circuit 74 driven by a reflected signal from an opto-sensor as the song interval detection device 2o detects a song interval. A gap detection signal and a record size detection signal are input. The control circuit 71 also receives a tone arm position detection signal from the tone arm device 18 (corresponding to the signal from the light receiving element 39) and a tone arm down detection signal (corresponding to the switch built in the tone arm 26). and the tone arm device 18
A drive signal is output to the plunger 30 for vertically moving the tone arm device 18, and a drive signal is output to the drive circuit 76 (corresponding to the motor 51) for moving the tone arm device 18. Note that an offset angle detection signal (corresponding to the signal from the light receiving element 47) from the tone arm device 18 is input to the drive circuit 75. The control circuit 71 outputs a drive signal for driving the muting switch circuit 26 provided in the transmission system of the cartridge output from the tone arm device 18. 77 is a drive circuit for the motor 79 for rotating the turntable 1e, and 78 is the rotation speed of the motor 79 (45 rpm or higher).

is a rotation speed switching circuit for switching the rotation speed (33 rpm), and these drive circuit 77 and rotation speed switching circuit 78 are also controlled by the output from the control circuit 71.

The microcomputer 71 serving as the control circuit sends and receives signals to and from the various circuits 72 to 78 described above, and is pre-equipped with routines for various functions described below.

The RAM in the microcomputer as the control circuit 71 has a counter for detecting between songs, a counter for waiting time, and a counter for detecting the end of a song (5ELE).
CT C0UNTER), counter for recognizing the lead-in position, counter for recognizing that the tone arm has been pulled back by a preset distance when moving in the reverse direction (A counter), tone A counter (B counter) for not reading the inter-track detection signal at the edge of a certain record disc when detecting the inter-track interval in synchronization with moving the arm in the forward direction, and the end of the record disc. A counter (WOR) that temporarily works to recognize the distance between songs when performing song detection.
KING C0UNTER), a counter for blinking the display element corresponding to the operated repeat key or program key (LEDFLASHC0UNTER), operation status of each key such as STEP, SP, REPEAT, CUEING, PROGRAM, etc. It is equipped with memos 1 and 1 (KEYSCAN) for reading the data, and also has an RO in the microcomputer as the control circuit 71.
M is initial mote routine, standby routine,
It is equipped with a program mote routine, an auto mote routine, a frame group routine, a skip mold routine, a search routine, a search mold routine, etc. These control circuits 71 control the record player's automatic program selection function, program repeat function, and special cue. Various functions are available, including a cue function between 9 songs and a search function between 2 songs.

Next, as for the safety function against a malfunction of the tone arm lift-up device, as shown in Figure 6, a lift command is issued to the lift-up device and the lift-up device is activated.

If the tone arm does not lift up within a certain period of time, the tone arm is recognized as a malfunction, the turntable is stopped, and the turntable is notified of this, and the arm is not moved. This certain period of time needs to be longer than the time required for the arm to lift up.

As described above, according to this embodiment, accidents caused by failure of the lift-up device can be prevented, and failure of the lift-up device can be notified by stopping the rotation of the turntable.

As is clear from the embodiments above, the present invention provides a tone arm, a lift-up device for raising the tone arm, a lift-up command means for giving a command to raise the tone arm, and a lift-up device for raising the tone arm. Lift-up detection means for detecting this, and the rotation of the tone arm is stopped by the output of the lift-up detection means after a certain period of time after a lift command is given to the tone arm. It is possible to prevent unexpected accidents caused by malfunctions.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view showing an embodiment of the record player of the present invention, FIG. 2 is an external perspective view of the player when the lid is opened, FIG. 3 is an enlarged configuration diagram of the main parts of the player, and FIG. FIG. 4 is an explanatory diagram of the operation of the inter-song sensor of the same player, FIG. 5 is a system block diagram of the same player, and FIG. 6 is a flowchart diagram for explaining the operation of the same player. 19...Tone arm device, 2e...Tone arm, 30...Plunger, 31...
...Lift axis, 51...Motor. Name of agent: Patent attorney Toshio Nakao and 1 other person
4 Figure α b The procedural amendment form in Figure 6 is the formula) % Formula % 2 Name of the invention Record player 3 Person making the amendment 4 Agent 571 Address 1006 Oaza Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] comprising a tone arm, a lift-up device for raising the tone arm, a lift-up command means for giving a raise command to the tone arm, and a lift-up detection means for detecting that the tone arm has been raised; A record player in which rotation of the tone arm is stopped by an output from a lift-up detection means after a certain period of time after a lift command is given.