JPH08190763A - Recording medium detecting device - Google Patents

Abstract

PURPOSE: To correctly detect the presence and the absence of a disk at the disk loading position without adversely affecting the size and the simplicity of the device by arranging light emitting and light receiving elements on the same side of a disk and first and second light reflecting members in the opposite side of the above elements with respect to the disk. CONSTITUTION: Light emitting and receiving elements 3 and 4 are provided in the one side of an optical disk 101 and a pair of reflecting plates 15 and 16 is provided in the opposite side. A hood member 5 and a shield plate 7 are provided to cover each element 3 and 4 and a reflecting light beam R3 from the disk 101 is shielded. When the disk 101 is not present, a light beam R1 directed to the plate 15 from the element 3 is reflected by the plates 15 and 16, reaches the element 4 to detect the absence of the disk 101. Since the elements 3 and 4 are arranged on a same substrate 1, the wiring constitution is simplified, the size of the device is reduced and the constitution of the device is simplified. Since the disk 101 is detected by the transmitted light beams at two separate positions, an accurate detection of the disk is realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium detecting device for detecting the presence / absence of a recording medium at a mounting position.

[0002]

2. Description of the Related Art Heretofore, a recording medium such as an optical disc has been proposed, and a recording / reproducing apparatus for recording and reproducing an information signal using this 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. And, this recording / reproducing apparatus, with respect to the 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, when the optical pickup device or the magnetic head device is operated in a state where the recording medium is not mounted at the mounting position, the optical pickup device or the magnetic head device is damaged,
There is a risk that an accident may occur in which the laser light flux emitted from the optical pickup device is emitted to the outside.

Therefore, in the above recording / reproducing apparatus,
A recording medium detection device for detecting whether or not the recording medium is mounted at the mounting position is provided.

In this recording medium detecting device, when the recording medium is an optical disc, as shown in FIG. 12, the light emitting elements 108 are arranged so as to face each other via the mounting position of the optical disc 101. And light receiving element 1
There are those in which 07 and 07 are provided. That is, the light emitting element 108 is attached downward to the upper printed circuit board 106 provided on the top plate side of the outer housing 110 of the recording / reproducing apparatus. The light receiving element 107 is a lower printed circuit board 105 provided on the bottom plate side of the outer casing 110.
Is installed upwards.

In this recording medium detecting device, 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 disc 101 is mounted, the light receiving element 107
Does not receive the light flux because the light flux emitted by the light emitting element 108 is blocked by the optical disc 101.

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

Further, the recording medium detecting device shown in FIG. 1 is used when the recording medium is an optical disc.
As shown in FIG. 3, the light emitting element 108 and the light receiving element 1 are provided on the same side with respect to the mounting position of the optical disc 101.
There are those in which 07 and 07 are provided. That is, the light emitting element 108 and the light receiving element 107 are held by the holder 109 and mounted on the lower printed circuit board 105 in an upward direction.

In this recording medium detecting apparatus, when the optical disc 101 is not mounted, the light beam emitted by the light emitting element 108 does not return to the light receiving element 107 and is not received by the light receiving element 107. . Then, when the optical disc 101 is mounted, the light receiving element 107 causes the light beam emitted by the light emitting element 108 to pass through the optical disc 10.
Since it is reflected by 1 and returns, the light beam is received.

That is, in the case of using this recording medium detecting device, if the light receiving element 107 receives the light beam from the light emitting element 108, the optical disc 101 is mounted and the light emitting element is installed. Although the light emitting element 108 emits light,
If the light flux from 08 is not received, it can be determined that the optical disc 101 is not mounted.

[0012]

By the way, as described above, in the recording medium detecting device having the light emitting element 108 and the light receiving element 107 which face each other through the mounting position of the optical disc 101, the outer casing is used. Inside the body 101, the upper printed circuit board 106 must be provided on the top plate side. The upper printed circuit board 106 and the lower printed circuit board 105 must be connected via a flexible circuit board or a wire. The upper printed circuit board 106 can be omitted if the light emitting element 108 does not have to be arranged above the mounting position.

Therefore, this recording medium detecting device increases the occupied volume of the printed circuit board in the outer casing 101, which is an obstacle to downsizing of the recording / reproducing device. Further, since the upper printed circuit board 106 has to be connected to the lower printed circuit board 105, the number of electrically connected points increases, which lowers the electrical reliability and complicates the manufacturing and assembling.

Further, in this recording medium detecting device, as shown in FIG. 14, the optical disc 102 having a small diameter is used.
When the outer diameter conversion adapter 103 is attached to the outer peripheral portion of the optical disc 102, the light flux emitted from the light emitting element 108 may pass through the slit 104 of the outer diameter conversion adapter 103. There is a possibility that the optical disc 102 may be erroneously determined not to exist even though the optical disc 102 is mounted.

The outer diameter conversion adapter 103 is formed in an annular shape, as shown in FIG. 11, and has an inner peripheral side portion for facilitating attachment to the outer peripheral portion of the small diameter optical disc 102. It has a plurality of slits 104, and the inner peripheral edge portion is elastically displaceable in the outer peripheral side direction.

The outer diameter conversion adapter 103 has the same outer diameter as the outer diameter (for example, 12 cm) of the large-diameter optical disc 101, and the inner diameter equals the outer diameter (for example, 8 cm) of the small-diameter optical disc 102. The optical disc 102 having a small diameter can be handled in the same manner as the optical disc 101 having a large diameter.

The light emitting element 108 and the light receiving element 1 are arranged on the same side with respect to the mounting position of the optical disc 101.
In the recording medium detecting device in which the optical disc 101 and the optical disc 101 are arranged, the light receiving element 107 depends on the state of the reflectance of the surface of the optical disc 101, particularly when the reflectance of the surface of the optical disc 101 is low. Sufficient luminous flux is not returned, and there is a risk of false detection.

Further, in each of the recording medium detecting devices described above, there is a possibility that a malfunction may occur due to the light receiving element 107 detecting ambient light.

Therefore, the present invention has been proposed in view of the above-mentioned circumstances, and does not hinder the downsizing and simplification of the device configuration of the applicable recording / reproducing apparatus, and the recording medium An object of the present invention is to provide a recording medium detection device capable of accurately detecting the presence or absence of a recording medium at the mounting position.

[0020]

In order to solve the above problems and achieve the above objects, a recording medium detecting apparatus according to the present invention comprises a light emitting means for emitting light toward a mounting position of a 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, and a pair disposed so as to face the light emitting means and the light receiving means through the mounting position of the recording medium. And a shielding member arranged between the light emitting means and the light receiving means, wherein the light receiving means emits light by the light emitting means, and the light receiving means emits light by the first reflecting member. The light flux reflected and further reflected by the second reflecting member is received.

Further, according to the present invention, in the recording medium detecting apparatus, the recording medium is an optical disc.

[0022]

In the recording medium detecting apparatus according to the present invention, the light receiving means emits light toward the mounting position by the light emitting means arranged on the same side as the light receiving means with respect to the mounting position of the recording medium. It is reflected by a first reflecting member arranged facing the light emitting means via a position, and further reflected by a second reflecting member arranged facing the light receiving means via the mounting position. Since the light beam is received and the direct light from the light emitting means is blocked by the shielding member arranged between the light emitting means and the light receiving means, only the light beam that has passed twice through the mounting position of the recording medium is received. To do.

In the recording medium detecting device, when the recording medium is an optical disc, the light receiving element receives only the light flux that has passed twice through the mounting position of the recording medium. Accurate detection can be performed even if the reflectance or the transmittance of the surface of the disk changes.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings.

In this example, the recording medium detecting device according to the present invention is configured as a device for detecting whether or not the optical disc is mounted in a disc player device for reproducing an information signal using an optical disc as a recording medium. Is.

As shown in FIG. 10, an optical disc which is a recording medium in this disc player device has a disc-shaped disc substrate made of a transparent synthetic resin material such as polycarbonate (PC). . The diameter of this disk substrate is, for example, 12 cm. A chucking hole 1 is provided at the center of the disk substrate.
05 is formed. The chucking hole 105 has a diameter of, for example, 15 mm.

Fine pits corresponding to information signals are formed on one main surface portion of the disk substrate by injection molding means. The pits are arranged on a spiral track which is substantially concentric on one main surface of the disk substrate. A reflective layer made of a metal material such as aluminum is adhered to one main surface of the disk substrate.

Further, the above-mentioned optical disc is also configured as a small-diameter optical disc 102, as shown in FIG. The diameter of this small-diameter optical disc is, for example, 8c.
It is said to be m. Even in the small-diameter optical disc 102, the large-diameter optical disc 10 is provided in the central portion.
A chucking hole 105 similar to that of No. 1 is formed. When the small-diameter optical disc 102 is mounted in the disc player device, as shown in FIG. 11, an outer diameter conversion adapter 103 is attached to the outer peripheral portion.

The outer diameter conversion adapter 103 is formed in an annular shape, and has a plurality of slits 104 in the inner peripheral side portion in order to facilitate attachment to the outer peripheral portion of the small diameter optical disc 102. 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 disk 101, and the inner diameter the same as the outer diameter of the small-diameter optical disk 102. The optical disc 102 can be handled like the large-diameter optical disc 101.

As shown in FIGS. 7 and 8, the disc player device has a chassis 20 arranged in an outer casing (not shown). This chassis 20
Is formed in a housing shape whose upper side is open. On the bottom plate portion of the chassis 20, the printed board 1 on which a plurality of electronic elements are arranged is arranged. The printed circuit board 1 and the electronic elements on the printed circuit board 1 constitute an electronic circuit section of the disc player device.

A float chassis 27 is arranged on the bottom plate portion of the chassis 20 via a plurality of damper members 28. The float chassis 27 is so-called floating-supported with respect to the chassis 20 by the damper members 28 so that vibrations and impacts from the chassis 20 are not transmitted.

A spindle motor 29 is attached to the float chassis 27. A disk table 30 is attached to the tip end side of the drive shaft facing the upper side of the spindle motor 29. At the center of the upper surface of the disc table 30, there is formed a protrusion that is fitted into the chucking hole 105 of the optical disc 101, 102 to center the optical disc 101, 102. On the disc table 30, the central portions of the optical discs 101 and 102 are placed.

An optical pickup device 35 is movably attached to 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. The optical pickup device 35 is configured to emit a light beam to be condensed via the objective lens 36. Then, the optical pickup device 35 irradiates the optical discs 101 and 102 with the light flux, and the optical discs 101 and 102
The light beam reflected by 102 is detected by the photodetector.

In the optical pickup device, the optical disc 1 is based on the output from the photodetector.
Information signals from 01 and 102 can be read.

The optical pickup device 35 is movable in the contacting and separating direction with respect to the disc table 30, and extends over the inner and outer circumferences of the optical discs 101 and 102 placed on the disc table 30. The information signal can be read.

On the upper side of the float chassis 27,
A chucking arm 32 is provided. The chucking arm 32 can be moved and operated in the contacting / separating direction with respect to the float chassis 27. A chucking plate 31 is rotatably attached to a central portion of the chucking arm 32 via an attachment member 33.

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

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

A loading roller 25 is arranged on the front side of the chassis 20. As shown in FIG. 9, the loading roller 25 is rotatably supported by the support plate 22. This loading roller 25
Is rotationally operated by a loading motor via the transmission pulley 23 and the transmission gear 24, and the supporting plate 22 is moved to be movable in the contacting / separating direction with respect to the bottom plate portion of the chassis 20. ing.

On the upper part of the chassis 20, the top plate 2
1 is provided. The sliding plate 2 is attached to the lower surface of the top plate portion 21 corresponding to the loading roller 25. The sliding plate 2 is made of a synthetic resin material, and the loading roller 25 is attached to the chassis 20.
When the optical disc 1 is moved in a direction away from the bottom plate of the optical disc 1, the optical disc 1 cooperates with the loading roller 25.
01 and 102 are sandwiched.

When the loading roller 25 is rotated, the optical discs 101 and 102 sandwiched between the loading roller 25 and the sliding plate 2 are rearward, depending on the rotation direction of the loading roller 25. That is, it is conveyed in the direction toward the disc table 30 or in the front side, that is, in the direction in which it is ejected from the disc player device.

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

The recording medium detecting apparatus according to the present invention, as shown in FIGS. 1 to 4 and 9, has a light emitting element 3 serving as a light emitting means for emitting light toward the mounting position of the optical discs 101 and 102. have. This light emitting element 3
Are arranged on the printed circuit board 1 so as to face upward. An LED can be used as the light emitting element 3.

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

The printed circuit board 1 is covered with the light emitting element 3 and the light receiving element 4, and the hood member 5 is provided.
Is provided. The hood member 5 is formed by integrally connecting two housing-shaped portions, a housing-shaped portion that covers the light emitting element 3 and a housing-shaped portion that covers the light receiving element 4. A boundary portion between these two housing-like portions is a shield plate portion 7 serving as a shield member located between the light emitting element 3 and the light receiving element 4.

The hood member 5 has a first opening 9 in the upper portion of the light emitting element 3. The hood member 5 has a second opening 10 in the upper portion of the light receiving element 4.

Then, on the upper surface of the above-mentioned slippery plate 2, there are first and second reflecting members which are paired with each other.
The reflector member 11 having the reflector portions 15 and 16 is attached. The reflector plate member 11 is formed of a metal plate material by bending both end portions thereof in the same direction at an angle of 45 °. Then, the both side portions of the reflector member bent at 45 ° have the above-mentioned first and second portions.
Of the reflectors 15 and 16.

The reflection plate member 11 is attached to the slippery plate 2 by a hook 14 projecting from the upper surface of the slippery plate 2.

The first reflecting plate portion 15 has the sliding plate 2
The through hole 12 formed in the optical disc 101 and the optical disc 101,
The light emitting element 3 is arranged so as to face the light emitting element 3 through the mounting position of the light emitting element 102. Further, the second reflecting plate portion 16 is provided with the light receiving element 4 through the through hole 13 formed in the sliding plate 2 and the mounting position of the optical discs 101 and 102.
Are disposed so as to face each other.

As shown by an arrow R ₁ in FIG. 2, the light receiving element 4 emits light by the light emitting element 3, is reflected by the first reflecting plate portion 15, and further, the second reflecting plate portion 16 is provided. The light flux reflected by is received. In this way, the light flux that reaches the light receiving element 4 moves to the mounting position 2
It has passed twice.

Further, the light receiving element 4 is provided with an arrow R _{2 in} FIG.
And as indicated by an arrow R ₃ , the direct light from the light emitting element 3 or the optical disc 10 held at the mounting position.
Since the reflected light from 1, 102 is blocked by the outer side portion of the hood member 5 and the shielding plate portion 7, only the light flux that has passed through the mounting position twice is received.

That is, in this recording medium detecting device, the optical discs 101, 102 are placed at the mounting positions.
When the light emitting element 3 is caused to emit light when the light emitting element 3 is not attached, the light receiving element 4 receives the light flux emitted by the light emitting element 3.

In this recording medium detecting device, the optical discs 101, 102 are placed at the mounting positions.
When the light emitting element 3 is attached, the light receiving element 4 does not receive the luminous flux emitted by the light emitting element 3 even if the light emitting element 3 emits light.

In this recording medium detecting apparatus, the light receiving element 4 receives the light flux which has passed through the two passing points separated from each other at the mounting position once, a total of two times. If any of the points are broken,
The luminous flux emitted from the light emitting element 3 is not received.

Therefore, in this recording medium detecting device, as shown in FIG.
Even if a void such as the slit 104 of the outer diameter conversion adapter 103 attached to the No. 02 is formed in the recording medium, accurate detection can be performed.

Further, in this recording medium detecting device,
Accurate detection can be performed even if the reflectance or transmittance of the surfaces of the optical discs 101 and 102 varies.

In this recording medium detecting device, since the light emitting element 3 and the light receiving element 4 can be arranged on the same printed circuit board 1, the device structure of the disc player device can be downsized. It does not hinder simplification.

The recording medium detection device according to the present invention is
Instead of the hood member 5, as shown in FIG. 5, a pair of cover members 17, 17 that respectively cover the light emitting element 3 and the light receiving element 4 may be used. Each of the cover members 17 is formed in a housing shape and is arranged on the printed circuit board 1. An opening 18 is opened in the upper surface of the cover member 17.

The luminous flux emitted by the light emitting element 3 reaches the first reflecting plate portion 15 through the opening 18 of the cover member 17 which covers the light emitting element 3. Further, the light flux reflected by the second reflecting plate portion 16 reaches the light receiving element 4 through the opening 18 of the cover member 17 which covers the light receiving element 4.

That is, the light receiving element 4 emits light by the light emitting element 3, is reflected by the first reflecting plate portion 15, and further, by the second reflecting plate, as shown by an arrow R ₁ in FIG. The light flux reflected by the unit 16 is received. The light flux thus reaching the light receiving element 4 has passed through the mounting position twice.

The luminous flux 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 indicated by arrows R ₂ and R ₃ in FIG. In addition, as shown in FIG. 6, the recording medium detecting device according to the present invention includes the light emitting element 3 on the printed circuit board 1.
It may be arranged between the light receiving element 4 and the light receiving element 4, and a shielding plate 19 serving as a shielding member may be provided upright. The upper edge of the shield plate 19 is close to the optical discs 101 and 102 mounted in the mounting position.

Also in this case, the light receiving element 4 is
As indicated by an arrow R ₁ in FIG. 6, the luminous flux emitted by the light emitting element 3, reflected by the first reflector portion 15 and further reflected by the second reflector portion 16 is received. The light flux thus reaching the light receiving element 4 has passed through the mounting position twice.

The luminous flux emitted from the light emitting element 3 and not reaching the first reflector portion 15 is indicated by an arrow R in FIG.
_As indicated by ₂ and arrow R ₃ , it does not reach the light receiving element 4.

In the recording medium detecting apparatus according to the present invention, the recording medium to be detected is not limited to the above-mentioned optical discs 101 and 102, and various recording media such as a tape-shaped recording medium may be used. can do.

[0066]

As described above, in the recording medium detecting device according to the present invention, the light receiving means is the mounting position of the recording medium by the light emitting means arranged on the same side as the light receiving means. A second reflecting member, which is emitted toward the light source and is reflected by a first reflecting member which is arranged facing the light emitting means through the mounting position, and which is further arranged facing the light receiving unit through the mounting position. Receives the light flux reflected by the reflection member of
Direct light from the light emitting means is blocked by a shielding member arranged between the light emitting means and the light receiving means.

Therefore, in this recording medium detecting device, the light receiving means receives only the light flux which has passed twice through the mounting position of the recording medium.

That is, in this recording medium detecting device, the light emitting means and the light receiving means can be disposed on the same printed circuit board, and the recording / reproducing device to which the recording medium detecting device is applied has a device configuration. It does not hinder miniaturization and simplification.

Further, in this recording medium detecting device,
Since the light receiving means receives only the light flux that has passed through the mounting position of the recording medium twice, accurate detection can be performed even when a void such as a slit is formed in the recording medium. .

Then, in the recording medium detecting device,
When the recording medium is an optical disc, the light receiving means receives only the light flux that has passed through the mounting position of the recording medium twice, so that the reflectance or the transmittance of the surface of the optical disc varies. Even if there is, accurate detection can be performed.

That is, the present invention does not hinder the downsizing and simplification of the apparatus structure of the applicable recording / reproducing apparatus, and can accurately detect the presence or absence of the recording medium at the mounting position of the recording medium. It is possible to provide a recording medium detection device that can be used.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a recording medium detection device according to the present invention in a cutaway manner.

FIG. 2 is a vertical cross-sectional view showing the configuration of the recording medium detection device.

FIG. 3 is a vertical cross-sectional view showing a state in which a large-diameter optical disc is mounted in the recording medium detection device.

FIG. 4 is a vertical cross-sectional view showing a state in which a small-diameter optical disc having an outer diameter conversion adapter is mounted in the recording medium detection device.

FIG. 5 is a vertical cross-sectional view showing another example of the configuration of the recording medium detection device according to the present invention.

FIG. 6 is a vertical sectional view showing still another example of the configuration of the recording medium detection device according to the present invention.

FIG. 7 is a perspective view showing a configuration of a main part of a recording / reproducing device to which a recording medium detecting device according to the present invention is applied.

FIG. 8 is a perspective view showing an internal configuration of the recording / reproducing apparatus.

FIG. 9 is an exploded perspective view showing an arrangement state of a recording medium detection device according to the present invention in the recording / reproducing device.

FIG. 10 is a perspective view showing a configuration of a large-diameter optical disc mounted on the recording / reproducing apparatus.

FIG. 11 is a perspective view showing a 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. 12 is a vertical cross-sectional view showing the configuration of a conventional recording medium detection device.

FIG. 13 is a vertical cross-sectional view showing another example of the configuration of the conventional recording medium detection device.

FIG. 14 is a vertical cross-sectional view showing a state in which a small-diameter optical disc to which an outer diameter conversion adapter is attached is mounted in a conventional recording medium detection device.

[Explanation of symbols]

 3 Light-Emitting Element 4 Light-Receiving Element 5 Hood Member 7 Shielding Plate Section 15 First Reflecting Plate Section 16 Second Reflecting Plate Section 101, 102 Optical Disc

Claims (2)

[Claims] 1. A light emitting means for emitting light toward a mounting position of a recording medium, a light receiving means disposed on the same side as the light emitting means with respect to a mounting position of the recording medium, and a mounting position of the recording medium. A pair of first and second reflecting members arranged to face the light emitting means and the light receiving means, respectively, and a shielding member arranged between the light emitting means and the light receiving means. The recording medium detecting device, wherein the light receiving means receives the light flux emitted by the light emitting means, reflected by the first reflecting member, and further reflected by the second reflecting member. 2. The recording medium detecting device according to claim 1, wherein the recording medium is an optical disc.