JP2013171609A - Disk device including optical detection unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk device capable of solving such a problem that external light entering from a disk insertion slot is received by a photo detector of an optical detection unit and causes malfunction of detecting the state.SOLUTION: An optical detection unit 15A includes a light-emitting element 17 and a photo detector 19 that face each other in both sides of a moving area of a disk D. A shielding cover 21 is provided on the photo detector 19. The shielding cover 21 has a tip-portion shielding part 22, a light transmission hole 23 formed on the tip-portion shielding part 22, and a tapered side-portion shielding part 24 gradually downward enlarging from a peripheral edge 22a of the tip-portion shielding part 22. Therefore, light emitted from the light-emitting element 17 is received by the photo detector 19, and it is unlikely that the external light from an insertion slot 4 is directly applied to the photo detector 19.

Description

  The present invention relates to a disk device in which a disk is inserted from an insertion opening formed in a case, and more particularly to a disk device in which an optical detection unit for detecting a disk is provided inside the case.

  Many so-called slot-in type disk devices in which a disk is inserted from an insertion opening formed in the case in a direction along the disk surface are provided with an optical detection unit inside the case. When the optical detection unit detects that the disc has been inserted from the insertion slot, the transport unit in the case is started and the loading of the disc into the case is started. Alternatively, it is determined whether the disc inserted from the insertion slot is a regular disc to be accepted, based on a combination of detection outputs of a plurality of optical detection units.

  As described in Patent Document 1, the optical detection unit has a light emitting element composed of a light emitting diode (LED) on one side and a photo on the other side of the moving area of the disk inserted in the insertion slot. A light receiving element formed of a transistor is disposed.

  When the disc is not inserted, the light emitted from the light emitting element is received by the light receiving element. When the disk passes between the light emitting element and the light receiving element, the light receiving element receives light.

  The control unit provided in the optical detection unit determines that the disc is not detected when the light receiving element detects a light amount that is equal to or greater than a predetermined threshold value, and the received light amount of the light receiving element is When the value falls below the threshold, it is determined that a disk has been detected.

JP 2007-226902 A

  The insertion slot of the disc device is provided with a shielding film made of thin rubber or felt material. When the disc is inserted from the insertion slot, the disc is fed into the case while deforming the shielding membrane. It has become.

  The insertion port is blocked by the shielding film. However, when strong light is directly applied to the insertion port, light leaks from the shielding film into the case, and strong light is given to the light receiving element. Sometimes. For example, if the disk device is installed in the vehicle interior with the insertion port facing upward, and the direct sunlight enters the vehicle interior and is directly irradiated to the insertion port, the above phenomenon is likely to occur.

  When the disk starts to be inserted from the insertion slot, intense light is irradiated to the insertion slot, and this light is directly applied to the light receiving element, or is reflected by the lower surface of the disk and applied to the light receiving element. Despite passing right above the element, the amount of light received by the light receiving element exceeds the threshold value. In this case, although the disk is inserted from the insertion slot, the control unit cannot make the determination, the transport mechanism is not started, and a malfunction occurs in which the disk is not transported into the case.

  In addition, when a strong external light is applied to any of the plurality of optical detection units and the amount of received light exceeds the threshold value while the disk is being carried into the case by the transport mechanism, the light receiving element Despite the fact that a regular disk has passed right above, the combination of detection signals from a plurality of optical detection units is not in a predetermined order, and it is determined that the regular disk is not being transported normally. Will be. In this case, the carrying-in of the regular disk is stopped or the disk is forcibly carried out.

  The present invention solves the above-described conventional problems, and provides a disk device having an optical detection unit that can reduce the probability that light entering the case directly affects the light receiving element of the optical detection unit. It is intended to provide.

The present invention includes a case having an insertion port, a disk holding unit that is positioned inside the case and holds a disc, a transport unit that is positioned between the insertion port and the disk holding unit, and that transports the disc. In the disc device provided with the optical detection unit provided between the insertion port and the disc holding unit,
The optical detection unit has a light emitting element on one side and a light receiving element on the other side of the moving area of the disc, and a shielding cover is arranged between the moving area and the light receiving element.
The shielding cover includes a tip shielding portion that faces the light receiving element, a light passage hole that is formed in the tip shielding portion and is smaller than an area of the tip shielding portion, and is laterally separated from the light passage hole. And a side shielding portion that extends continuously from the tip shielding portion toward the light receiving element, and the side shielding portion is formed to gradually spread toward the light receiving element. It is characterized by this.

  In the present invention, the tip shielding part and the light passage hole are circular, and the side shielding part is tapered.

  In the present invention, it is preferable that the tip shielding part and the side shielding part are obtained by pressing a surface-treated metal plate, and the surface-treated surface appears on the inner surface of the side shielding part. .

  In the present invention, the shielding cover faces the light receiving element of the optical detection unit. When a light passage hole is opened at the front-facing portion of the shielding cover and no disk is present on the light passage hole, light emitted from the light emitting element passes through the light passage hole and is received by the light receiving element. .

  In the shielding cover, the opening diameter of the light passage hole is smaller than the area of the front shielding portion, and the inner surface of the side shielding portion is located away from the light passage hole. Even if the light entering the case from the insertion port may enter obliquely from the light passage hole, the inner surface of the side shielding part is located away from the light passage hole, and therefore reflected by the inner surface of the side shielding part. Light hardly enters the light receiving element. Further, since the side shielding portion has a tapered shape that spreads toward the light receiving element, it is difficult for the light that has entered from the light passage hole to face the light receiving element when reflected by the inner surface of the side shielding portion.

  Furthermore, since the inner surface of the side shielding portion is a surface-treated surface of the metal plate, the light reflectance by this inner surface is lowered.

  From the above, even if light entering from the insertion port and further light reflected from the disk is applied to the shielding cover, it is difficult for the light receiving element to receive light directly.

The top view which shows the disc apparatus of embodiment of this invention, Sectional drawing which cut | disconnected the disk apparatus shown in FIG. 1 by the II-II line | wire, The perspective view of the metal plate by which the shielding cover was pressed, An enlarged sectional view showing the shape of the light receiving element and the shielding cover,

  A disk device 1 shown in FIGS. 1 and 2 includes a metal housing 2 and a synthetic resin panel 3 installed in front of the housing 2, and a slit-shaped insertion slot on the front surface of the panel 3. 4 is formed. The housing 2 and the panel 3 constitute a case of the disk device 1.

  The disk device 1 is for in-vehicle use, and the housing 2 is embedded in an instrument panel or dashboard in the interior of the automobile, and the panel 3 appears on the surface thereof. In the installation example of the disk device shown in FIG. 2, the housing 2 is installed obliquely with respect to the horizontal direction H in the vehicle interior, and the front surface of the panel 3 and the insertion port 4 are directed toward the ceiling in the vehicle interior. And diagonally upward.

  As shown in FIG. 1, a disk holding unit 5 is provided at the center inside the housing 2. The disk holding unit 5 includes a rotating shaft 6, a turntable 7 fixed to the rotating shaft 6, a spindle motor that rotates the rotating shaft 6, and a clamp that holds the center hole Da of the disk D on the turntable 7. Member.

  As shown in FIGS. 1 and 2, a transport unit 10 is provided between the insertion port 4 of the panel 3 and the disc holding unit 5. The transport unit 10 includes a roller shaft 11 and transport rollers 12 and 12 provided on the outer periphery of the roller shaft 11. A sliding member 13 made of synthetic resin is fixed below the ceiling plate 2a of the housing 2, and a lower surface of the sliding member 13 serves as a sliding guide surface 13a. When the disk device 1 is waiting to receive the disk D, as shown in FIG. 2, the transport rollers 12 and 12 are elastically pressed toward the sliding member 13 by the force of the spring.

  As shown in FIG. 1, optical detection units 15 </ b> A, 15 </ b> B, and 15 </ b> C are provided in a plurality of locations (three locations) between the insertion port 4 and the transport unit 10 inside the housing 2. 2 and 4 show the structure of the optical detection unit 15A. The structure of the other optical detectors 15B and 15C is substantially the same as that of the optical detector 15A.

  As shown in FIG. 2, the upper sensor substrate 16 is fixed under the ceiling plate 2 a of the housing 2, and the light emitting element 17 constituting the optical detection unit 15 </ b> A and the other two optical detections are arranged on the upper sensor substrate 16. Light emitting elements 17 and 17 constituting the portions 15B and 15C are mounted. The sliding member 13 has transmission holes 13b through which light emitted from each of the light emitting elements 17 at three locations is transmitted.

  As shown in FIG. 2, the lower sensor substrate 18 is fixed on the bottom plate 2 b of the housing 2, and the light receiving element 19 constituting the optical detection unit 15 </ b> A on the lower sensor substrate 18 and the other two optical detections. Light emitting elements 19 and 19 constituting the portions 15B and 15C are mounted.

  In each of the optical detection units 15A, 15B, and 15C, the light-emitting elements 17 and the light-receiving elements 19 face each other in a direction that is orthogonal to the ceiling plate 2a and the bottom plate 2b of the housing 2. The light emitting element 17 is composed of a light emitting diode or the like, and the light receiving element 19 is composed of a phototransistor or a photodiode.

  As shown in FIG. 2, a shielding metal plate 20 is disposed inside the housing 2 at a distance above the bottom plate 2 b. A shielding cover 21 is integrally formed on the shielding metal plate 20 at positions corresponding to the three optical detection portions 15A, 15B, and 15C. As shown in FIGS. 2 and 4, each shielding cover 21 is formed in a shape that is located above the light receiving element 19 and protrudes toward the ceiling plate 2a.

  The shielding metal plate 20 is formed by pressing a surface-treated rolled steel plate. The shielding cover 21 is formed by drawing upward in the press working, and a surface-treated surface appears on the inner surface of the shielding cover 21. The surface treatment of the shielding metal plate 20 is performed by plating or coating with an organic material or an inorganic material, and exhibits a hue such as black, gray, or green so that the reflectance is smaller than the surface of the rolled steel plate. Yes. Alternatively, the surface treatment may be performed by processing the surface of the rolled steel sheet into fine irregularities by a sandblast method or the like.

  As shown in FIG. 4, the shielding cover 21 has a tip shielding portion 22 that is opposed to the upper side of the light receiving element 19. The front shield part 22 has a plane part perpendicular to the lower sensor substrate 18 and perpendicular to the center line O passing through the center of the light receiving element 19, and a light passage hole 23 is opened in this plane part. Yes. The opening area A1 of the light passage hole 23 is sufficiently small with respect to the area A0 of the front shield part 22, and preferably the diameter of the light passage hole 23 is less than ½ with respect to the diameter of the front shield part 22. .

  The peripheral edge 22 a of the front shield 22 is located at a position farther in the radial direction than the peripheral edge of the light passage hole 23. The shielding cover 21 is integrally formed with a side shielding portion 24 having a tapered surface shape that extends toward the shielding metal plate 20 starting from the peripheral edge portion 22a. The side shielding portion 24 is formed so that the radius gradually increases from the peripheral edge portion 22a toward the skirt portion 24a.

  The diameter of the peripheral edge 22a, which is the upper end of the side shield 24, is larger than the width dimension B of the upward light-receiving area of the light receiving element 19, and the diameter of the peripheral edge 22a is 2 of the width dimension B. It is more than double.

However, the front shield part 22 has a curved surface shape having no flat part, or has a deformed part and a curved surface part, and the side shield part 24 extends from the front part shield part 22 to the peripheral part 22a. It may be continuous as a curved surface.
Further, the light passage hole 23 may be formed of a transparent synthetic resin material or the like.

  The disk device 1 is provided with a control unit, and a detection signal from the light receiving element 19 is given to the control unit. Each light emitting element 17 emits light continuously or intermittently.

  In the optical detection units 15A, 15B, and 15C, the light emitting element 17 and the light receiving element 19 face each other across the moving region of the disk D. Therefore, when the disk D does not reach the light passage hole 23, the light emitting element The detection light emitted from 17 passes through the light passage hole 23 and is given to the light receiving element 19, the amount of light received by the light receiving element 17 exceeds a predetermined value, and the detection signal obtained from the light receiving element 19 has a threshold value. Over.

  When the detection signal of the light receiving element 19 exceeds the threshold value, the control unit determines that the optical detection unit has not detected the disk. When the detection signal falls below the threshold value, the control unit detects the disk. Judge that

  When the control unit determines that the optical detection unit 15A located closest to the insertion port 4 has detected the disc, the control unit issues a command to start the conveyance motor, and the roller shaft 11 of the conveyance unit 10 starts in the conveyance direction. Then, the disk D starts to be carried toward the inside of the housing 2. Thereafter, the control unit monitors the detection signals of the optical detection units 15A, 15B, and 15C, and when the optical detection units 15A, 15B, and 15C detect the disks in a predetermined order, a regular disk D having a diameter of 12 cm is mounted. It is determined that the body 2 is normally conveyed.

  In the loaded state where the center hole Da of the disk D is held by the turntable 7, the disk D is positioned on all the optical detection units 15A, 15B, 15C, and all the optical detection units 15A, 15B, 15C Detected state.

  When the disk D is carried out from the insertion port 4 by the transport unit 10, when the optical detection unit 15B switches to a state in which the disk is not detected, the transport motor is stopped and the rotation of the roller shaft 11 is stopped to stop the disk. Complete the unloading operation. At this time, a large part of the disk D protrudes from the insertion port 4 to the outside, and the end is sandwiched between the transport roller 12 and the sliding member 13.

  1 and 2 show the moment when the disk D starts to be inserted into the housing 2 from the insertion slot 4. When direct sunlight such as western sunlight enters the passenger compartment, external light L0 with strong direct sunlight enters the inside of the housing 2 from between the insertion port 4 of the disk device 1 and the lower surface of the disk D, and on the lower surface of the disk D. It is reflected and easily given directly to the shielding cover 21. In particular, as illustrated in FIG. 2, when the insertion opening 4 is directed obliquely upward as the installation posture of the disk device 1, strong external light L <b> 0 due to direct sunlight is easily given to the insertion opening 4.

  In FIG. 4, an arbitrary optical axis L <b> 1 of the external light that is irradiated from the direction of the insertion port 4 toward the shielding cover 21 and enters the light passage hole 23 obliquely is shown. The shielding cover 21 has a tapered surface in which the inner surface 24b of the side shielding portion 24 is located farther away from the edge of the light passage hole 23, and the inner surface 24b gradually spreads toward the bottom plate 2b. Therefore, the optical axis L1 shown in FIG. 4 does not hit the inner surface 24b, and the optical axis L1 is not reflected by the inner surface 24b and does not go to the light receiving element 19.

  FIG. 4 also shows an optical axis L2 that passes through the light passage hole 23 at the shallowest angle with respect to the bottom plate 2b (the largest angle with respect to the center line O). The peripheral edge 22a, which is the upper end of the inner surface 24b of the side shield 24, is located away from the edge of the light passage hole 23 and the light receiving area of the light receiving element 19, and the inner surface 24b is a tapered surface. Even if the axis L2 is incident on the inner surface 24b at the incident angle θ and reflected at the reflection angle θ, the optical axis L2 does not reach the light receiving element 19.

  That is, the position of the peripheral edge portion 22a of the front shield 22 and the angle of the tapered surface of the inner surface 24b, the distance between the light receiving element 19 and the light passage hole 23, and the like are the light that has passed through the light passage hole 23 at the shallowest angle. It is determined so that the reflected light of the axis L2 does not reach the light receiving area of the light receiving element 19.

  Since the shape of the shielding cover 21 is determined as described above, the light receiving element 19 other than light parallel to the center line O extending perpendicularly from the lower sensor substrate 18 or light slightly tilted with respect to the center line O is used. It becomes difficult to reach.

  Further, since the surface 24b of the shielding metal plate 20 appears on the inner surface 24b of the side shielding part 24 of the shielding cover 21, the reflectance itself of the inner surface 24b is low. Also by this, the probability that external light is reflected toward the light receiving element 19 by the inner surface 24b can be reduced.

  From the above, in the optical detection units 15A, 15B, and 15C, the light emitted from the light emitting element 17 is received by the light receiving element 19, but the external light that has entered obliquely from the direction of the insertion port 4 directly enters the light receiving element 19. Probability given to becomes lower.

  Therefore, when the disc D inserted from the insertion port 4 reaches the optical detection unit 15A, the inconvenience that external light is received by the light receiving element 19 and the insertion start of the disc D cannot be detected can be prevented. Further, when the disk D is being transported toward the inside of the housing 2, the light receiving element 19 detects the external light in any one of the optical detection units 15A, 15B, and 15C and enters a light receiving state, and the regular disk D Can be prevented from being determined to be in an abnormal loading state despite being loaded normally.

DESCRIPTION OF SYMBOLS 1 Disc apparatus 2 Housing | casing 3 Panel 4 Insertion slot 5 Disc holding part 7 Turntable 10 Conveyance part 12 Conveyance roller 13 Sliding member 15A, 15B, 15C Optical detection part 17 Light emitting element 19 Light receiving element 20 Shielding metal plate 21 Shielding cover 22 Front shield 22a Perimeter 23 Light passage hole 24 Side shield

Claims (3)

A case having an insertion port; a disk holding unit that is positioned inside the case and holds a disc; a transport unit that is positioned between the insertion port and the disk holding unit; In the disc device provided with the optical detection unit provided between the disc holding unit,
The optical detection unit has a light emitting element on one side and a light receiving element on the other side of the moving area of the disc, and a shielding cover is arranged between the moving area and the light receiving element.
The shielding cover includes a tip shielding portion that faces the light receiving element, a light passage hole that is formed in the tip shielding portion and is smaller than an area of the tip shielding portion, and is laterally separated from the light passage hole. And a side shielding portion that extends continuously from the tip shielding portion toward the light receiving element, and the side shielding portion is formed to gradually spread toward the light receiving element. A disk device having an optical detection unit.   2. The disk device having an optical detection unit according to claim 1, wherein the front shield part and the light passage hole are circular, and the side shield part is tapered.   The said front part shielding part and the said side part shielding part are the press-working of the surface-treated metal plate, The surface-treated surface has appeared in the inner surface of a side part shielding part. A disk device having an optical detection unit.

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