JPH08249800A - Disk detector - Google Patents

Abstract

PURPOSE: To efficiently operate a disk player by detecting the size, existence, etc., of disks mounted on plural trays during their loading time from an open position to a stock position. CONSTITUTION: A light emitting part 31 and a light receiving part 32 are disposed below and above three main trays 15 holding movably subtrays 10 respectively and on a perpendicular line L2 passing through disk centers in the stock position. When the main tray 15 is transferred from the open position to the stock position, it is constituted so that a through hole 20 and detecting holes 21 and 22 provided in the main tray 15 in the open position pass in turn a position above the light emitting part 31. By constituting in such a way, light from the light emitting part 31 can be received by the light receiving part 32 via any of the through hole 20 and detecting holes 21 and 22, and a transmitted light detecting signal 32a corresponding to a disk mounting state is outputted to a control circuit 33 by the light receiving part 32, and the size and existence of the disk is decided by the control circuit 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc detecting device, and more particularly to a disc detecting device for detecting the size and presence / absence of a disc mounted in a disc player.

[0002]

2. Description of the Related Art One tray is loaded from a stock position of a so-called tray type disc player, for example, a CD (compact disc) changer for mounting and holding a disc on a tray, and is loaded at a CD reproducing position which is a recording medium. As a disc detecting device for determining the presence or absence of a disc and the size of the disc by means of a plurality of translucent light disposed at predetermined positions on the disc detecting element and the tray during completion, it is proposed in, for example, Japanese Patent Laid-Open No. 62-99957. What is known is.

In Japanese Laid-Open Patent Publication No. 62-99957, the size and presence / absence of a disc are determined by disposing a plurality of translucent members extending in the loading direction of a spindle on a tray on which the disc is mounted. A disc detecting element is provided at a position through which the tray is loaded, and the presence / absence and size of the disc are determined based on the detection output of the disc detecting element.

[0004]

However, since the conventional disc detection device is configured to determine the presence and size of the recording medium in one tray, a plurality of trays are present in overlapping order and the detection is desired. When there is a disc other than the tray, if the disc exists other than the tray to be detected, the detection light is not transmitted, so that there is a disadvantage that the detection output cannot be obtained and the above determination cannot be performed.

The present invention has been made to solve the above problems, and its purpose is to detect the size and presence / absence of disks mounted on a plurality of trays during loading from an open position to a stock position, This is to enable efficient operation of the disc player.

[0006]

In order to solve the above-mentioned problems, the first aspect of the present invention provides a sub-tray on which a disc as a recording medium is mounted, a main tray for holding the sub-tray, and a plurality of the main trays. In a disc player equipped with a casing, each main tray forms a through hole at a position corresponding to a disc center hole when the sub-tray on which the disc is mounted is held at the stock position in the casing, and A plurality of detection holes are formed on the axis line extending in the disc loading direction through the holes and at a position corresponding to the diameter of the disc, and on the perpendicular line extending vertically through the through hole and the plurality of main trays. A disc detection element consisting of a pair of a light emitting portion and a light receiving portion is arranged at a position sandwiching the above, and the main tray is outside the housing. The size of the disk and the presence / absence of the disk are determined by detecting the light projected from the light projecting section at the light receiving section through the detection hole and the through hole when the light is transferred from the on position to the stock position. To do.

According to a second aspect of the present invention, there is provided a disc player comprising a sub-tray on which a disc as a recording medium is mounted, a main tray for holding the sub-tray, and a housing for storing a plurality of the main trays. Each of the main trays has a through hole formed at a position corresponding to the disk center hole when the sub tray on which the disk is mounted is held at the stock position inside the housing, and an axis extending in the disk loading direction through the through hole. A plurality of detection holes are formed on a line and at a position corresponding to the diameter of the disc, and a pair of light projecting portions are arranged on a perpendicular line extending through the through hole in the vertical direction and sandwiching the plurality of main trays. And a disk detection element consisting of a light receiving section,
Further, the sub-tray has a sub-tray detection hole formed on an axis extending in the disc loading direction through the through hole, so that the main tray is transferred from an open position outside the housing to a stock position or when the sub-tray is played from the stock position. When the light is transferred to the position, the size of the disk and the presence / absence of the disk are determined by detecting the light projected from the light projecting section by the light receiving section through the detection hole, the through hole, and the sub-tray detection hole. It is determined whether or not it is mounted at the position.

[0008]

According to the first aspect, when the main tray is transferred from the open position to the stock position, the through holes and the detection holes formed at the positions corresponding to the diameters of the disks provided on the main tray are sequentially projected. The light receiving unit outputs a transmitted light detection signal of H level each time the light passes through the position above the element. Therefore, the size and presence / absence of the disk can be known by knowing the order in which the H-level transmitted light detection signal is generated.

According to the second aspect, when the main tray is transferred from the open position to the stock position, the through holes and the detection holes formed at the positions corresponding to the diameters of the disks provided on the main tray are sequentially projected. The H-level transmitted light detection signal is output from the light receiving unit each time the light passes through the position above the element.
Therefore, the size and presence / absence of the disk can be known by knowing the order in which the H-level transmitted light detection signal is generated. Further, when the sub-tray is transferred from the stock position to the play position, the light receiving section receives the light from the light projecting element through the sub-tray detection hole formed in the sub-tray and outputs the H-level transmitted light detection signal. Therefore, it can be seen that the disc is not mounted at the predetermined position.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view of a CD changer (disc player) to which the disc detecting device according to the first aspect of the present invention is applied, and shows a position (referred to as an open position) in which a main tray is pulled out from a housing.

The CD changer 1 has three openings 4 formed on the front surface 3 of the housing 2, and the main tray 15 on which the sub-tray 10 is placed can be drawn out from each of these openings 4. And a total of 3 discs D
(Recording medium) can be taken in and out.
The present invention is not limited to the reproduction-only disc player as described above, but may be one having a recording / reproducing function.

FIG. 2 is a plan view of the sub tray and the main tray of the CD changer. A concave portion 11a for accommodating a disc D or a concave portion 11b for accommodating a disc d having a smaller diameter is formed on the upper surface of the sub-tray 10, and a U-shaped notch for introducing an optical pickup unit (or a magneto-optical unit). 12 is formed, and the sub-tray 10 is configured to move the main tray 15 within a predetermined distance.

In the main tray 15, a position facing the disk center hole 5 (6) when the disk D (disk d) is mounted at a position where the main tray is pulled into the housing (referred to as a stock position). A through hole 20 is formed at a position facing the disk center hole 5 (6).

Further, two detection holes 21 and 22 penetrating the main tray 15 are formed on the axis L1 passing through the center 20a of the through hole 20 and extending in the loading direction.
These detection holes 21 and 22 are formed within the radius of the small-diameter disk d from the center 20a and at positions larger than the radius of the small-diameter disk d and smaller than the radius of the large-diameter disk D, respectively.

FIG. 3 is a side perspective view of a CD changer to which the disc detecting apparatus according to the present invention is applied, showing that the main tray 15 is held in the upper and lower three stages of the housing 2. A disk detection device 30 having a detection element composed of a pair of a light projecting section 31 and a light receiving section 32 for detecting a CD and a control circuit 33 are housed above and below, and a transmitted light detection signal is sent from the light receiving section 32 to the control circuit 33. 32
It indicates that a is output.

Reference numeral 40 is a tray transfer mechanism, 50 is an elevating mechanism, and 60 is a reproducing mechanism such as a turntable, which is controlled based on an instruction from the control circuit 33. At this time, the tray transfer mechanism 40 transfers each main tray 15 between the open position and the stock position. The sub-tray 10 on each main tray 15 is transferred from the stock position to the play position by the elevating mechanism 50 and regenerated by the regenerating mechanism 60.

Next, the disc detection device and the control circuit will be described. FIG. 4 is a perspective view showing a state in which three main trays that hold the sub-tray movably are stacked, and the middle main tray is pulled out of the three main trays that are provided so that they can be pulled out and inserted. Shows the open position.

A light projecting portion 31 and a light receiving portion are provided on a perpendicular line L2 which sandwiches three main trays 15 ... Each of which holds the sub trays 10 ... so as to be movable and which penetrates the center of the disk center hole 5 (6) at the stock position. The part 32 is provided.

In this embodiment, the light projecting portion 31 is on the lower side,
The case where the upper side is the light receiving section 32 is shown. The light projecting unit 31 uses a light projecting element such as a light emitting diode, and drives this light emitting element at a constant current based on the transfer of the main tray 15, for example.

A light receiving element such as a PIN photodiode or a phototransistor is used as the light receiving section 32. For example, an amplifier for amplifying the light receiving output thereof or an H level transmitted light detection signal 32a (when the light receiving signal level exceeds a threshold value). Figure 5
A comparator (see neither) is provided.

Therefore, when the main tray 15 is transferred from the open position to the stock position as shown by the arrow a, the through hole 20 and the detection holes 21 and 22 provided in the main tray 15 in the open position sequentially project light. By passing through the position above the portion 31, the through hole 20,
The light from the light projecting section 31 can be received through any of the detection holes 21 and 22, and the light receiving section 32 outputs a transmitted light detection signal (pulse) 32a corresponding to the disk mounting state.

The control circuit 33 controls the transmitted light detection signal 32a.
Are monitored, and the size and presence / absence of the disc are determined in the order (timing) at which the transmitted light detection signal 32a is generated.

FIG. 5 is a signal waveform diagram showing the detection output of the disc detection element (light receiving portion). Next, the operation of the disc detection device will be described with reference to FIGS. In FIG.
t1 is the detection hole 2 of the main tray 15 in the open position
When 2 is opposed to the through hole 20 of the main tray 15 in the stock position, t2 is the main tray 1 in which the detection hole 21 of the main tray 15 in the open position is in the stock position.
5, the time point t3 faces the through hole 20 of the main tray 15 at the stock position, and the time point t3 shows the time point at which the through hole 20 of the main tray 15 at the open position faces the through hole 20 of the main tray 15.

When the main tray 15 is in the open position and a close button (not shown) is pressed, the loading operation to the stock position is started as shown by the arrow a.
As a result, the main tray 15 passes above the light projecting section 31.

When a large-diameter (12 cm) disk D is mounted Since the disk D is stored in the recess 11a, both the detection hole 22 and the detection hole 21 of the second-stage main tray 15 in the open position are provided. Blocked by the disk D, the transmitted light detection signal 32a at the time points t1 and t2 is at the L level, and at the time point t3, the through holes 20 ... Of the main tray 15 ...
When they match each other, the transmitted light detection signal 32a rises from the L level to the H level, and this state is continued for a predetermined time (see FIG. 5A).

The control circuit 33 loads the large-diameter (12 cm) disk D when the H-level transmitted light detection signal 32a is supplied at time t3 during the transfer of the disk from the open position to the stock position. It is determined that it has been done.

When a disc d having a small diameter (8 cm) is mounted Since the disc d is stored in the recess 11b, the detection hole 22 of the second main tray 15 at the open position is not blocked by the disc d. Therefore, the transmitted light detection signal 32a is at the H level for a period corresponding to the size of the detection hole 22 from the time point t1. At time t2, the detection hole 21 has the disk d
The transmitted light detection signal 32a becomes L level, and when the through holes 20 of the main tray 15 coincide with each other at time t3, the transmitted light detection signal 32a changes from L level to H level.
The level rises and this state is continued for a predetermined time (see FIG. 5B).

When the H level transmitted light detection signal 32a is supplied at the times t1 and t3 during the transfer of the disc from the open position to the stock position in this way, the control circuit 33 determines that the disc d having a small diameter (8 cm) is present. It is determined that it is installed.

When the disc is not mounted Since the disc is not housed in either the concave portion 11a or the concave portion 11b, the through hole 20 at the stock position is not blocked by the disc, and the times t1 and t2 are not reached.
In, the transmitted light detection signal 32a is at the H level for a time corresponding to the sizes of the detection holes 22 and 21. At time t3, the through holes 20 of the main tray 15 coincide with each other, the transmitted light detection signal 32a rises from the L level to the H level, and this state is continued for a predetermined time (FIG. 5C).
reference).

The control circuit 33 transfers the disc from the open position to the stock position in this way, at time t1,
The transmitted light detection signal 32 of H level at t2 and t3
When a is supplied, it is determined that the disc is not mounted, and the control circuit 33 (see FIG. 3) does not transfer the disc to the play position even when the sub-tray 10 is instructed to be transferred to the play position. . As described above, according to the disc detection device of the present application, the size and presence / absence of the disc can be reliably determined by monitoring the generation order of the H-level transmitted light detection signals.

FIG. 6 is a plan view in the stock position of the disk detecting device according to claim 2 of the present invention, which shows a state where a large-diameter disk is mounted at a predetermined position,
The same parts as those in FIG. 2 are designated by the same reference numerals.

In this embodiment, in addition to the above-described embodiment, the sub-tray detecting hole 14 is formed in the sub-tray 10 which is held on the main tray 15 so as to be movable for a certain distance. The sub-tray detection hole 14 shares the light projecting section 31 and the light receiving section 32 (see FIG. 3). The position where the sub-tray detection hole 14 is formed is the main tray 1
5, the sub-tray 10 that does not coincide with the detection holes 21 and 22 formed on the axis 5 is on the axis L1 on which the loading operation is performed and the recess 11 is formed.
It is the front side in b. The operation of the main tray 15 up to the stock position is the same as that of the above-mentioned embodiment, and therefore its explanation is omitted.

When loading to the stock position, FIG.
The same signal waveform as in (a) is obtained, and it can be determined that the large-diameter disk D is mounted, and the sub-tray detection hole 1
Since No. 4 does not match the light projecting unit 31 and the light receiving unit 32, the H level transmitted light detection signal 32a corresponding to this sub tray detection hole 14 is not generated. Control circuit 33 (see FIG. 3)
In this state, it is determined that the large-diameter disk D is mounted at the proper position, and the disk D (sub tray 1
It is possible to transfer it to the play position (0) where the disc is held on the turntable for CD reproduction.

Further, when the sub tray 10 moves from the stock position to the play position, the sub tray detection hole 1
Since No. 4 is blocked by the large-diameter disk D, the H-level transmitted light detection signal 32a is not generated from the sub-tray detection hole 14 even if it passes through the through hole 20 of the main tray 15, and is transferred to the play position as it is. To be done. Here, 34 indicates a disc clamping area (a transparent portion formed outside the disc center hole).

FIG. 7 is a plan view of the disc detecting apparatus according to the second aspect of the present invention at the stock position, and shows the state in which a disc having a small diameter is mounted at a predetermined position,
The same parts as those in FIG. 6 are designated by the same reference numerals and the description thereof will be omitted.

When loading to the stock position, FIG.
The same signal waveform as in (b) is obtained, and it can be determined that the small-diameter disk d is mounted, and the sub-tray detection hole 1
Since No. 4 does not match the light projecting unit 31 and the light receiving unit 32, the H level transmitted light detection signal 32a corresponding to this sub tray detection hole 14 is not generated. Control circuit 33 (see FIG. 3)
In this state, it is determined that the small-diameter disc d is mounted at the proper position, and the disc d (sub tray 1
0) can be transferred to the play position.

Further, when the sub tray 10 moves from the stock position to the play position, the sub tray detection hole 1
Since No. 4 is closed by the disc d having a small diameter, the H-level transmitted light detection signal 32a is not generated from the sub-tray detection hole 14 even if it passes through the through hole 20 of the main tray 15, and is transferred to the play position as it is. It

FIG. 8 is a plan view of the disk detecting device according to the second aspect of the present invention in the stock position, and shows the state in which the disk is not mounted on the sub-tray.
The same parts as those shown in FIG.

When loading to the stock position, FIG.
The signal waveform is the same as that in (c), and it can be determined that the disc is not mounted. At this time, the control circuit 33 (see FIG. 3) does not transfer to the play position and opens the main tray 15 even when there is an instruction to transfer to the play position.

FIG. 9 is a plan view of the disc detecting apparatus according to the second aspect of the present invention at the stock position. The figure shows a state in which a large-diameter disc is not mounted at a predetermined position. Are denoted by the same reference numerals.

FIG. 10 is a signal waveform diagram showing the detection output of the disc detecting element (light receiving portion), which has a pattern that does not occur when the large-diameter disc D is properly mounted. That is, the light receiving unit 32 (see FIG. 3) outputs the H level transmitted light detection signal 32a corresponding to the detection hole 22 at the time t1 when loading to the stock position, and the H level transmitted light corresponding to the through hole 20 is transmitted. Since the detection signal 32a is not output, the control circuit 33 (see FIG. 3) determines that this state is abnormal and does not transfer to the play position even when there is an instruction to transfer to the play position. Let it open.

FIG. 11 is a plan view of the disk detecting device according to the second aspect of the present invention at the stock position. The drawing shows a state in which a large-diameter disk is less displaced than that in FIG. 9, and FIG.
The same parts as are indicated by the same reference numerals.

FIG. 12 is a signal waveform diagram showing the detection output of the disc detection element (light receiving portion). When loading to the stock position, light is transmitted through the transparent portion of the clamping area 34 to detect H level transmitted light. The same pattern as when a signal is generated and a small-diameter disc is mounted (Fig. 5 (b)).
Therefore, the control circuit 33 (see FIG. 3) determines that the disc D (sub-tray 10) can be transferred to the play position indicated by the arrow b, but after this, the disc D is transferred to the play position. Then, at time t4, the sub-tray detection hole 14 coincides with the through hole 20, and the sub-tray detection hole 1
Light from the light projecting unit 31 (see FIG. 3) passes through the light receiving unit 3
2 (see FIG. 3), the light receiving unit 32 outputs the transmitted light detection signal 32a of H level. At this time, the control circuit 33 (see FIG. 3) determines that this state is abnormal, stops the transfer of the sub tray 10, and at the same time, the main tray 1
Open 5 Therefore, the disc D is prevented from being caught between the main trays 15 ... In the figure, the signal waveform to the right of the A position is the signal waveform when the sub-tray has started to move.

FIG. 13 is a plan view of the disk detecting device according to the second aspect of the present invention at the stock position. The drawing shows a state where a small-diameter disk is not mounted at a predetermined position. The same reference numerals are given.

FIG. 14 is a signal waveform diagram showing the detection output of the disc detection element (light receiving portion), which has a pattern that does not occur when the small-diameter disc d is properly mounted. That is, the light receiving unit 32 (see FIG. 3) is set at the time points t1, t
2, the H-level transmitted light detection signal 32a corresponding to the detection holes 21 and 22 is output, so the control circuit 33 (see FIG. 3) determines that this state is abnormal. At this time, the control circuit 33 does not transfer to the play position even when there is an instruction to transfer to the play position, and opens the main tray 15.

[0046]

EFFECTS OF THE INVENTION The disk detecting device according to the present invention has the above-mentioned structure, and therefore exhibits the following effects. According to the first aspect of the present invention, each main tray has a through hole formed at a position corresponding to the disk center hole when the sub tray on which the disk is mounted is held at the stock position in the housing, and the disk loading is performed through the through hole. A plurality of detection holes are formed on the axis extending in the direction and at a position corresponding to the diameter of the disc, and a pair is formed at a position perpendicular to the through hole extending in the vertical direction and sandwiching the plurality of main trays. When a disk detection element including a light projecting section and a light receiving section is disposed and the main tray is transferred from an open position outside the housing to a stock position, the light projected from the light projecting section is transferred to the detection hole and Since the size of the disc and the presence / absence of the disc are determined by the detection by the light receiving unit through the through hole, the size and presence / absence of the disc can be reliably determined. Door can be.

According to the second aspect of the present invention, each main tray has a through hole formed at a position corresponding to the disk center hole when the sub tray on which the disk is mounted is held at the stock position in the housing, and passes through the through hole. A plurality of detection holes are formed on an axis extending in the disc loading direction and at a position corresponding to the diameter of the disc, and the plurality of main trays are sandwiched on a perpendicular line extending vertically through the through hole. A disc detecting element consisting of a pair of a light emitting portion and a light receiving portion is arranged at a position, and the sub tray has a sub tray detecting hole formed on an axis extending in the disc loading direction through the through hole. When transferring from the open position outside the housing to the stock position or when transferring the sub tray from the stock position to the play position, The size of the disk and the presence / absence of the disk are detected by detecting the light emitted from the light section through the detection hole, the through hole, and the sub-tray detection hole, and whether or not the disk is mounted at a predetermined position. Since it is determined whether or not the size and presence of the disc can be reliably determined. Further, since it can be surely determined whether or not the disc is mounted at a predetermined position, even if the disc cannot be mounted correctly, the damage can be prevented.

Therefore, the disc player having a plurality of trays stacked can be operated safely and efficiently.

[Brief description of drawings]

FIG. 1 is a perspective view of a CD changer to which a disk detection device according to claim 1 of the present invention is applied.

FIG. 2 is a plan view of a sub tray and a main tray of a CD changer to which the disc detection device according to claim 1 of the present invention is applied.

FIG. 3 is a CD to which the disc detection device according to the present invention is applied.
Side view of changer

FIG. 4 is a perspective view showing a state in which three main trays that hold the sub-tray movably are stacked.

FIG. 5 is a signal waveform diagram showing the detection output of the disc detection element (light receiving portion).

FIG. 6 is a plan view of the disk detection device according to claim 2 of the present invention at a stock position.

FIG. 7 is a plan view of a disk detection device according to claim 2 of the present invention at a stock position.

FIG. 8 is a plan view of a disk detection device according to claim 2 of the present invention at a stock position.

FIG. 9 is a plan view of the disk detection device according to claim 2 of the present invention at a stock position.

FIG. 10 is a signal waveform diagram showing the detection output of the disc detection element (light receiving portion).

FIG. 11 is a plan view of the disk detection device according to claim 2 of the present invention at a stock position.

FIG. 12 is a signal waveform diagram showing the detection output of the disc detection element (light receiving portion).

FIG. 13 is a plan view of the disk detection device according to claim 2 of the present invention at a stock position.

FIG. 14 is a signal waveform diagram showing the detection output of the disc detection element (light receiving portion).

[Explanation of symbols]

1 ... CD changer, 2 ... Housing, 3 ... Front surface, 4 ... Opening portion, 5, 6 ... Disc center hole, 10 ... Sub tray,
11a, 11b ... Recesses, 12, 18 ... Notches, 13, 1
9 ... Rack, 14 ... Sub tray detection hole, 15 ... Main tray, 16, 17 ... Guide groove, 20 ... Through hole 21, 22
... Detection hole, 30 ... Disk detection device, 31 ... Projector, 3
2 ... Light receiving part, 32a ... Transmitted light detection signal, 33 ... Control circuit, 34 ... Disk clamping area.

Claims (2)

[Claims] 1. A disc player including a sub-tray on which a disc as a recording medium is mounted, a main tray for holding the sub-tray, and a housing for storing a plurality of the main trays, wherein each main tray stores the disc. When the mounted sub-tray is held at the stock position in the housing, a through hole is formed at a position corresponding to the disk center hole, and an axial line extending in the disk loading direction through the through hole is formed depending on the diameter of the disk. A plurality of detection holes are formed at a predetermined position, and a disc detection consisting of a pair of a light projecting portion and a light receiving portion is provided on a perpendicular line extending through the through hole in the up-down direction and sandwiching the plurality of main trays. When the element is installed and the main tray is transferred from the open position outside the housing to the stock position, the light is emitted from the light emitting unit. A disc detecting device, characterized in that the size of the disc and the presence or absence of the disc are determined by detecting the generated light through the detection hole and the through hole by the light receiving section. 2. A disc player comprising a sub-tray on which a disc as a recording medium is mounted, a main tray for holding the sub-tray, and a housing for storing a plurality of the main trays, wherein each main tray stores the disc. When the mounted sub-tray is held at the stock position in the housing, a through hole is formed at a position corresponding to the disk center hole, and an axial line extending in the disk loading direction through the through hole is formed depending on the diameter of the disk. A plurality of detection holes are formed at a predetermined position, and a disc detection consisting of a pair of a light projecting portion and a light receiving portion is provided on a perpendicular line extending through the through hole in the up-down direction and sandwiching the plurality of main trays. An element is provided, and the sub-tray is detected on the axis extending in the disc loading direction through the through hole. When a hole is formed and the main tray is transferred from an open position outside the housing to a stock position, or when the sub-tray is transferred from a stock position to a play position, the light projected from the light projecting unit is supplied to the detection hole and A disc detecting device characterized in that the size of the disc, the presence / absence of the disc, and whether or not the disc is mounted at a predetermined position are determined by detection by a light receiving portion through the through hole and the sub tray detection hole. .