JP2001155415A - Disk detecting device in disk player - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk detecting device in which respective elements 3, 4 can be disposed on one surface side of a disk 101, the constitution of electrical wiring can be simplified thereby and the accurate detection can be performed because transmitting light is detected at two places for the disk 101. SOLUTION: This disk detecting device 101 is provided with a light emitting element 3 and a light receiving element 4 on one surface side and a pair of reflection plates 15, 16 which are integrally formed on the opposite side. Therein, the reflected light R3 from the disk 101 is shielded by disposing a hood 5 covering the respective elements 3, 4. When the disk 101 does not exist, the light R1 which is directed toward the reflection plate 15 from the light emitting element 3 is reflected by the respective reflection plates 15, 16 and attains to the light receiving element 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting the presence or absence of a disc such as an optical disc at a mounting position in a disc player.

[0002]

2. Description of the Related Art Hitherto, a recording medium such as an optical disk has been proposed, and a recording / reproducing apparatus (disc player) for recording and reproducing an information signal using the recording medium has been proposed.

This recording / reproducing apparatus has means for writing and reading information signals, such as an optical pickup device and a magnetic head device. Then, the recording / reproducing apparatus is provided for a recording medium mounted at a predetermined mounting position.
The optical pickup device and the magnetic head device are configured to write and read information signals.

In the recording / reproducing apparatus, if the optical pickup device or the magnetic head device operates in a state where the recording medium is not mounted at the mounting position, breakage of the optical pickup device or the magnetic head device,
There is a possibility that an accident may occur in which a laser beam emitted from the optical pickup device is emitted outward.

Therefore, in the recording / reproducing apparatus,
A disk detection device in a disk player for detecting whether the recording medium is mounted at the mounting position is provided.

[0006] As a disc detecting device in the disc player, when the recording medium is an optical disc, as shown in FIG.
In some cases, a light emitting element 108 and a light receiving element 107 are provided so as to face each other via the mounting position of No. 01. That is, the light emitting element 108 is provided on the upper printed circuit board 10 provided on the top plate side of the outer casing 110 of the recording / reproducing apparatus.
6 is attached downward. The light receiving element 107 is mounted upward on a lower printed circuit board 105 provided on the bottom plate side of the outer casing 110.

In the disc detecting device in the disc player, when the optical disc 101 is not mounted, the light beam emitted by the light emitting element 108 is received by the light receiving element 107. When the optical disk 101 is mounted, the light receiving element 107 does not receive the light beam because the light beam emitted by the light emitting element 108 is blocked by the optical disk 101.

That is, when using the disk detecting device in the disk player, if the light receiving element 107 receives the light beam from the light emitting element 108, the optical disk 101 is not mounted. ,
If the light receiving element 107 does not receive the light beam from the light emitting element 108 even though the light emitting element 108 emits light, it can be determined that the optical disk 101 is mounted.

Further, as a disk detecting device in the disk player, when the recording medium is an optical disk, as shown in FIG. , A light emitting element 108 and a light receiving element 107 are provided. That is, the light emitting element 108 and the light receiving element 107
Is held by the holder 109, and the lower printed circuit board 1
At 05, it is attached upward.

In the disk detecting device in the disk player, when the optical disk 101 is not mounted, the light beam emitted by the light emitting element 108 does not return to the light receiving element 107, No light is received. When the optical disk 101 is mounted, the light receiving element 107 receives the light beam because the light beam emitted by the light emitting element 108 is reflected by the optical disk 101 and returned.

That is, in the case of using the disk detecting device in the disk player, if the light receiving element 107 receives the light beam from the light emitting element 108, the optical disk 101 is mounted, If the light receiving element 107 does not receive the light beam from the light emitting element 108 even though the light emitting element 108 emits light, it can be determined that the optical disk 101 is not mounted.

[0012]

By the way, as shown in FIG. 11, a disk detecting device in a disk player having a light emitting element 108 and a light receiving element 107 opposed to each other via the mounting position of the optical disk 101. , The upper printed circuit board 106 must be provided on the top plate side in the outer housing 101. The upper printed board 106 and the lower printed board 105
Must be connected via a flexible substrate or a wire.

Therefore, the disk detecting device in the disk player increases the occupied volume of the printed circuit board in the outer casing 101, which hinders the miniaturization of the recording / reproducing device. Further, since the upper printed board 106 must be connected to the lower printed board 105, the number of electrical connections increases, which leads to a decrease in electrical reliability and a complicated manufacturing and assembly.

Further, in the disk detecting device in the disk player, as shown in FIG.
In the case where the light emitting element 1 is used, the slit 104 of the outer diameter conversion adapter 103 is provided.
Since the light beam emitted from the optical disc 102 may pass through, there is a possibility that an erroneous determination that the optical disc 102 is not present may be made even though the optical disc 102 is mounted.

The outer diameter conversion adapter 103 is formed in an annular shape as shown in FIG. 10, and is provided on an inner peripheral side portion of the small-diameter optical disc 102 in order to facilitate attachment to the outer peripheral portion. It has a plurality of slits 104, and its inner peripheral edge is elastically displaceable in the lateral direction.

The outer diameter conversion adapter 103 has the same outer diameter as the large diameter optical disc 101 (eg, 12 cm) and the same inner diameter as the small diameter optical disc 102 (eg, 8 cm). This is to enable the small-diameter optical disk 102 to be handled in the same manner as the large-diameter optical disk 101.

The optical disc 1 shown in FIG.
01 on the same side with respect to the mounting position
In the disk detecting device in the disk player provided with the optical disk 101 and the light receiving element 107, the optical disk 101
In particular, when the reflectance of the surface of the optical disk 101 becomes low due to the change in the state of the light reflectance due to the adhesion of dust and dirt on the reflection surface of the surface of the optical disk 101, a sufficient light flux Does not return, and there is a risk of erroneous detection.

Therefore, the present invention has been proposed in view of the above-mentioned circumstances, and does not hinder the miniaturization and simplification of the configuration of a recording / reproducing apparatus to which the present invention is applied. An object of the present invention is to provide a disk detecting device in a disk player that can accurately detect the presence or absence of a recording medium at a mounting position.

[0019]

In order to solve the above-mentioned problems and achieve the above-mentioned object, a disk detecting device in a disk player according to the present invention comprises: a light-emitting means for emitting light toward a mounting position of a recording medium; A light receiving unit disposed on the same side as the light emitting unit with respect to the mounting position of the recording medium, and first and second reflecting plate portions respectively opposed to the light emitting unit and the light receiving unit via the mounting position of the recording medium. A light-reflecting means, wherein the light-receiving means receives light emitted by the light-emitting means, reflected by the first reflector, and further reflected by the second reflector. Is what you do.

In the apparatus for detecting a disk in a disk player according to the present invention, the light receiving means emits light toward the mounting position by a light emitting means arranged on the same side as the light receiving means with respect to the mounting position of the recording medium. The light is reflected by a first reflector disposed opposite the light emitting means through the mounting position, and further reflected by a second reflector disposed opposite the light receiving means through the mounting position. And only the light beam that has passed through the mounting position of the recording medium twice is received.

In the disk detecting device in the disk player, the light receiving element receives the light beam that has passed through the mounting position of the recording medium twice, so that the reflectance of the surface of the disk mounted at the mounting position fluctuates. Even if there is, accurate detection can be performed.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

A disk detecting device in a disk player according to the present invention is a device for detecting whether or not an optical disk is mounted in a disk player device for reproducing an information signal using an optical disk as a recording medium.

As shown in FIG. 9, an optical disk serving as a recording medium in this disk player device has a disk-shaped disk substrate made of a transparent synthetic resin material such as polycarbonate (PC). . The diameter of the disk substrate is, for example, 12 cm.
A chucking hole 105 is provided at the center of the disk substrate.
Are formed. The diameter of the chucking hole 105 is, for example, 15 mm.

Fine pits corresponding to information signals are formed on one main surface of the disk substrate by injection molding. The pits are arranged on spiral tracks that are substantially concentric on one main surface of the disk substrate. A reflection layer made of a metal material such as aluminum is formed on one main surface of the disk substrate.

As shown in FIG. 10, the optical disk is also configured as an optical disk 102 having a small diameter. The diameter of this small-diameter optical disc is, for example, 8c
m. Also in this small-diameter optical disc 102, the large-diameter optical disc 10
A chucking hole 105 similar to 1 is formed.

When the small-diameter optical disc 102 is mounted on the disc player apparatus, an outer-diameter conversion adapter 103 is attached to the outer peripheral portion as shown in FIG.

The outer diameter conversion adapter 103 is formed in an annular shape, and has a plurality of slits 104 on the inner peripheral side to facilitate mounting of the small diameter optical disc 102 on the outer peripheral portion. The peripheral portion is elastically displaceable in the outer peripheral direction.

The outer diameter conversion adapter 103 has the same outer diameter as the outer diameter of the large-diameter optical disc 101, and the same inner diameter as the outer diameter of the small-diameter optical disc 102. The optical disk 102 can be handled in the same manner as the large-diameter optical disk 101.

As shown in FIGS. 6 and 7, the disc player device has a chassis 20 provided in an outer casing (not shown). This chassis 20
Are formed in a housing shape whose upper side is open (FIG. 7).
reference). On the bottom plate of the chassis 20, a printed circuit board 1 on which a plurality of electronic elements are provided is provided. The printed board 1 and the electronic elements on the printed board 1 constitute an electronic circuit section of the disc player device.

On the chassis 20, a float chassis 27 is disposed via a plurality of damper members 28. The float chassis 27 is mounted on each of the damper members 2.
8, so-called floating support is provided on the chassis 20, so that vibrations and impacts from the chassis 20 are not transmitted.

A spindle motor 29 is mounted on the float chassis 27. A disk table 30 is attached to a tip end of a drive shaft directed upward from the spindle motor 29. At the center of the upper surface of the disk table 30, a projection is formed which fits into the chucking hole 105 of the optical disks 101 and 102 and performs centering of the optical disks 101 and 102. On the disk table 30, the central part of the optical disks 101 and 102 is placed.

An optical pickup device 35 is movably mounted on the float chassis 27. The optical pickup device 35 has an optical block, and a semiconductor laser serving as a light source, a photodetector such as a photodiode, and various optical devices are built in the optical block. Further, the optical pickup device 35 is configured to emit a condensed light beam via an objective lens 36. Then, the optical pickup device 35 irradiates the optical disks 101 and 102 with the light beam, and detects the light beams reflected by the optical disks 101 and 102 by the photodetector.

The optical pickup device 35 can be moved in the direction of contacting and separating from the disk table 30, and extends over the inner and outer circumferences of the optical disks 101 and 102 placed on the disk table 30. The information signal can be read and reproduced based on the output from the photodetector.

A chucking arm 32 is provided above the float chassis 27. The chucking arm 32 is connected to the float chassis 27.
Can be moved vertically. At the center of the chucking arm 32, a mounting member 3 is provided.
3, a chucking plate 31 is rotatably mounted.

When the chucking arm 32 is moved toward the float chassis 27, the chucking plate 31 cooperates with the disc table 30,
The optical discs 101 and 102 placed on the disc table 30 hold the central portion therebetween.

That is, the space between the disk table 30 and the chucking plate 31 is the mounting position of the optical disks 101 and 102.

On the front side of the chassis 20, a loading roller 25 is provided. The loading roller 25 is rotatably supported by the support plate 22, as shown in FIG. This loading roller 25
Is rotated by a loading motor via a transmission pulley 23 and a transmission gear 24, and is moved in the vertical direction with respect to the bottom plate of the chassis 20 by moving the support plate 22. I have.

On the upper part of the chassis 20, a top plate 2
1 is provided (see FIG. 6). The lubricating plate 2 is attached to the lower surface of the top plate 21 so as to correspond to the loading roller 25. The slip plate 2 is formed of a synthetic resin material, and cooperates with the loading roller 25 when the loading roller 25 is moved in a direction away from the bottom plate of the chassis 20 to cooperate with the optical disk 101. , 102.

When the loading roller 25 is operated to rotate, the optical discs 101 and 102 held between the loading roller 25 and the slippery plate 2 move rearward, depending on the rotation direction of the loading roller 25. That is, the disc is conveyed in a direction toward the disc table 30 or in a front side, that is, in a direction in which the disc is discharged from the disc player device.

The loading roller 25 applies the optical disks 101 and 102 to the disk table 30.
The disc table 30 and the chucking plate 31 are transported to the optical discs 101 and 10.
When the disk 2 is sandwiched, the disk is moved to the bottom plate side of the chassis 20 to be separated from the optical disks 101 and 102.

As shown in FIGS. 1 to 4, the disk detecting device in the disk player according to the present invention includes a light emitting element 3 serving as a light emitting means for emitting light toward the mounting position of the optical disks 101 and 102. have. The light emitting element 3 is disposed on the printed board 1 so as to face upward. As the light emitting element 3, an LED can be used.

On the printed circuit board 1, there is provided a light receiving element 4 which is on the same side as the light emitting element 3 with respect to the mounting position of the optical disks 101 and 102 and serves as light receiving means. .

A hood member 5 is provided on the printed circuit board 1 so as to cover the light emitting element 3 and the light receiving element 4.
Are arranged. The hood member 5 is formed by integrally connecting two housing-like portions, a housing-like portion covering the light emitting element 3 and a housing-like portion covering the light receiving element 4. A boundary portion between these two housing-like portions is a shielding plate portion 7 serving as a shielding member located between the light emitting element 3 and the light receiving element 4.

The hood member 5 has a first opening 9 above the light emitting element 3. The hood member 5 has a second opening 10 above the light receiving element 4.

A reflector member 11 having a pair of first and second reflector portions 15 and 16 is attached to the upper surface of the slippery plate 2. The reflecting plate member 11 is made of a metal plate material, and has 45
It is bent in the same direction at an angle of .degree., And as shown in FIGS. 1 to 4, it is formed by bending the central portion of the flat portion so as to protrude upward in a trapezoidal shape. 45 of the reflector
The two side portions bent at an angle are formed to be trapezoidal slope portions facing each other, and the first and second reflection plate portions 1 are formed.
5 and 16.

The reflecting plate member 11 is hooked on a hooking claw 14 projecting from the upper surface of the lubricating plate 2 so that the lubricating plate 2
Mounted against.

The first reflector 15 is provided with the lubricating plate 2
And the optical disc 101,
The light emitting element 3 is disposed to face the light emitting element 3 via the mounting position 102. Further, the second reflection plate portion 16 is connected to the light receiving element 4 via the through hole 13 formed in the slippery plate 2 and the mounting position of the optical disks 101 and 102.
Are disposed opposite to each other.

The light receiving element 4 emits light by the light emitting element 3 and is reflected by the first reflector 15 as shown by an arrow R ₁ in FIG. Receives the light beam reflected by the. In this manner, the light flux reaching the light receiving element 4 is moved to the mounting position by 2
Has passed many times.

When the optical discs 101 and 102 are held at the mounting position, the light receiving element 4 is indicated by the direct light from the light emitting element 3 or by arrows R ₂ and R ₃ in FIG. As described above, the reflected light from the optical discs 101 and 102 is blocked by the outer side portion of the hood member 5 and the shielding plate portion 7, and receives the light beam that has passed through the mounting position twice.

That is, in the disc detecting device in the disc player, when the optical discs 101 and 102 are not mounted at the mounting positions, the light emitting element 3 emits light, and the light receiving element 4 The light beam emitted by the light emitting element 3 is received.

In the disc detecting device in the disc player, when the optical discs 101 and 102 are mounted at the mounting positions, the light-receiving element 4 emits light even if the light-emitting element 3 emits light. The light emitted from the light emitting element 3 is not received.

In the disc detecting device in the disc player, the light receiving element 4 receives the light beam that has passed twice, once at two passing points separated from each other at the mounting position, a total of two times. If any of the passing points is blocked, the light beam emitted from the light emitting element 3 is not received.

Therefore, in the disk detecting device in the disk player, as shown in FIG. 4, a gap such as the slit 104 of the outer diameter conversion adapter 103 attached to the small diameter optical disk 102 is formed on the recording medium. Even if it is formed, since the light receiving element 4 does not receive the light beam emitted from the light emitting element 3, accurate detection can be performed.

In the disc detecting device in the disc player, the optical discs 101, 10
Even if there is a change in the reflectance or transmittance of the surface of No. 2, accurate detection can be performed.

In the disk detecting device in the disk player, the light emitting element 3 and the light receiving element 4 can be arranged on the same printed circuit board 1. It does not hinder miniaturization and simplification.

The disk detecting device in the disk player according to the present invention is different from the hood member 5 in FIG.
As shown in (1), a pair of cover members 17, 17 covering the light emitting element 3 and the light receiving element 4, respectively, may be used. The cover members 17 are each formed in a housing shape, and are disposed on the printed circuit board 1. An opening 18 is formed in the upper surface of the cover member 17.

The luminous flux emitted from the light emitting element 3 reaches the first reflector 15 through the opening 18 of the cover member 17 covering the light emitting element 3. The light beam reflected by the second reflection plate 16 reaches the light receiving element 4 via the opening 18 of the cover member 17 that covers the light receiving element 4.

[0059] That is, the light receiving element 4, as shown in Figure 5 in an arrow R _1, is emitted by the light emitting element 3 is reflected by the first reflector portion 15, further, the second reflector The light beam reflected by the unit 16 is received. The light beam that reaches the light receiving element 4 in this manner has passed through the mounting position twice.

The light beam emitted from the light emitting element 3 and not reaching the first reflecting plate portion 15 does not reach the light receiving element 4 as shown by arrows R ₂ and R ₃ in FIG.

[0061]

As described above, in the disk detecting device in the disk player according to the present invention, the light receiving means
A first light emitting unit is provided to emit light toward the mounting position by a light emitting unit disposed on the same side as the light receiving unit with respect to the mounting position of the recording medium, and is disposed to face the light emitting unit via the mounting position. A light beam reflected by the reflection plate portion and further reflected by the second reflection plate portion disposed opposite to the light receiving means via the mounting position is received.

Therefore, in the disk detecting device in the disk player, the light receiving means receives the light beam which has passed the mounting position of the recording medium twice.

That is, in the disk detecting device in the disk player, the light emitting means and the light receiving means can be arranged on the same printed circuit board, and the recording to which the disk detecting device in the disk player is applied. It does not hinder miniaturization and simplification of the device configuration of the playback device.

In the disk detecting device in the disk player, the light receiving means receives the light beam which has passed through the mounting position of the recording medium twice, so that the recording medium is formed with a gap such as a slit. Even if it is, accurate detection can be performed, and even if the reflectance or transmittance of the surface of the optical disc
Accurate detection can be performed.

The first and second reflectors in the disc detecting device in the disc player according to the present invention are formed by bending a reflector plate member having both ends bent in the same direction by a metal plate material. The both sides are the first
And a second reflector portion. The reflecting plate member is attached by a locking claw provided on a plate made of a synthetic resin material.

That is, the present invention does not hinder the miniaturization and simplification of the configuration of the recording / reproducing apparatus to which the present invention is applied, and can accurately detect the presence or absence of a disc at the position where a recording medium is mounted. It is possible to provide a device for detecting a disc in a disc player.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a configuration of a disc detecting device in a disc player according to the present invention.

FIG. 2 is a longitudinal sectional view showing a configuration of a disc detection device in the disc player.

FIG. 3 is a longitudinal sectional view showing a state where a large-diameter optical disc is mounted in the disc detection device in the disc player.

FIG. 4 is a longitudinal sectional view showing a state in which a small-diameter optical disk to which an outer diameter conversion adapter is mounted is mounted in the disk detection device in the disk player.

FIG. 5 is a longitudinal sectional view showing another example of the configuration of the disc detecting device in the disc player according to the present invention.

FIG. 6 is a perspective view showing a configuration of a main part of a recording / reproducing apparatus to which a disk detecting device in a disk player according to the present invention is applied.

FIG. 7 is a perspective view showing an internal configuration of the recording / reproducing apparatus.

FIG. 8 is an exploded perspective view showing an arrangement state of a disk detecting device in a disk player according to the present invention in the recording / reproducing device.

FIG. 9 is a perspective view showing a configuration of a large-diameter optical disc mounted on the recording / reproducing apparatus.

FIG. 10 is a perspective view showing the configuration of a small-diameter optical disc mounted on the recording / reproducing apparatus and an outer-diameter conversion adapter attached to the small-diameter optical disc.

FIG. 11 is a longitudinal sectional view showing a configuration of a conventional disk detecting device in a disk player.

FIG. 12 is a longitudinal sectional view showing another example of the configuration of a conventional disc detection device in a disc player.

FIG. 13 is a longitudinal sectional view showing a state in which a small-diameter optical disk to which an outer diameter conversion adapter is mounted is mounted in a conventional disk detection device in a disk player.

[Explanation of symbols]

3 light emitting element, 4 light receiving element, 5 hood member, 15
1st reflector portion, 16 second reflector portion, 101, 102
Optical disc

Claims (4)

[Claims] A light emitting means for emitting light toward a mounting position of the recording medium; a light receiving means disposed on the same side as the light emitting means with respect to the mounting position of the recording medium; A reflecting plate member having first and second reflecting plate portions opposed to the light emitting unit and the light receiving unit, respectively, wherein the light receiving unit emits light by the light emitting unit and the first reflecting plate A disc detector in the disc player, which receives a light beam reflected by the section and further reflected by the second reflecting plate section. 2. The reflection plate member is made of an integral metal plate material, and both end portions are formed by being bent in the same direction, and the bent both side portions are formed by the first and second reflection plate portions. 2. The apparatus for detecting a disc in a disc player according to claim 1, wherein: 3. The reflection plate member has a trapezoidal concave portion,
2. A disc in a disc player according to claim 1, wherein one side of the concave portion serves as a first reflector, and the other side of the recess serves as a second reflector. Detection device. 4. A reflection plate member is attached to a plate made of a synthetic resin material by a locking claw provided on the plate. 2. The apparatus for detecting a disc in a disc player according to claim 1, wherein: