JP3473019B2 - Rotation pulse detection mechanism - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation pulse detecting mechanism for detecting a rotation pulse of a rotating body which is detachably mounted on an upper part of a turntable for setting a disk in a disk device.

[0002]

2. Description of the Related Art Conventionally, as a recording / reproducing apparatus having a rotation pulse detecting mechanism, there is, for example, one shown in FIGS. As shown in FIGS. 3 and 4, this is a disc (DVD) 19 as an information recording disc.
A front loading DVD device (recording / reproducing device) is provided with a rotation monitoring mechanism having a mechanism for holding the disc 190 between the turntable unit 110 and the clamper unit 170 when 0 is rotated.

Therefore, the portion of the DVD device related to the rotation monitoring mechanism will be described. The DVD device has a substantially box shape, and operation buttons (Play button, Stop button, Eject button, etc.) are provided on the front surface thereof. Omitted) is provided. A dish portion of a front loading mechanism (not shown) is provided on the front side of the DVD device so as to be movable back and forth. An opening is provided in the central area of the plate. On the lower side where the opening is located when the dish is stored in the DVD device, there is a turntable portion 11 having a substantially two-stage disc shape, the central side of which has a convex portion 110a circular in plan view.
0, a DC motor 120 that drives the turntable 110 from the lower side, a vertical movement mechanism (not shown) that vertically moves the two, and an optical pickup mechanism (not shown).
And are provided.

The turntable portion 110 has a convex portion 110a.
An iron plate 110b is attached to the upper part of the. A clamper unit 170 is provided on the upper side of the turntable unit 110.
And a strip-shaped chucking plate 180 for rotatably holding the clamper portion 170. The main substrate 200 of the DVD device is provided on the upper side of the clamper section 170 and the plate 180. A circuit (not shown) such as a control unit for controlling and driving the entire DVD device and a sensor unit 140 described later are mounted on the main substrate 200.

The main substrate 200, the vertical movement mechanism and the plate 180 are fixed to a chassis (not shown) of the DVD device. The rotation monitoring mechanism includes a sensor unit 140 that is solder-fixed to the upper side of the clamper unit 170 and the lower surface side of the main board 200, and the sensor unit 1 to the clamper unit 170.
40 and a detected structure 175 provided so as to face each other. The sensor unit 140 is a so-called transmissive optical sensor, and includes a pair of a light emitting element 140A and a light receiving element 14A.
Has 0B. The light emitting element 140A is, for example, an infrared light emitting diode, and the light receiving element 140B is, for example, a phototransistor.

The sensor section 140 is fixed to the main board 200 by soldering as described above. However, the light emitting element 140A and the light receiving element 140B are such that the optical axis and the lead are in the same direction before molding. Therefore, the detected structure 175, the light emitting element 140A, and the light receiving element 140B.
In order to make the light emitting element 140A and the light receiving element 1 face each other,
The lead portions 140a and 140b with 40B are formed to be bent in a substantially L shape. Then, the light emitting element 140A and the light receiving element 140B thus formed are fixed so as to face each other so that the optical axes thereof are the same. The light emitting element 140A and the light receiving element 140B are solder-fixed to the main board 200 in this state.

Detected structure 1 provided on the clamper section 170
The numeral 75 is provided so as to extend to the upper side of the clamper section 170. The detected structure 175 includes the light emitting element 140.
It is provided on an extension line of the optical axes of A and the light receiving element 140B. The detected structure 175 includes a light shielding plate portion 175A which is a rectangular convex portion and a light passage portion 175B which is a concave portion provided between the light shielding plate portions 175A, which are provided in plural at a constant pitch. Therefore, the sensor unit 140 detects light passing / blocking due to the light passing portions 175B and the light blocking plate portions 175A of the detected structure 175 alternately passing between the light emitting element 140A and the light receiving element 140B. There is.

The clamper portion 170 has a lower portion 170A having a substantially H-shaped cross section (a shape in which a substantial H shape is laid sideways) and a detected structure 1 extending around the upper surface of the lower portion 170A.
And 75. On the lower surface side of the lower side portion 170A, a concave portion 172 into which the upper side of the convex portion 110a of the turntable portion 110 is fitted is provided. A magnet 171 is usually embedded in the bottom of the recess 172. This magnet 1
71 and the iron plate 110b of the turntable unit 110, in order to hold the disc 190 sandwiched between the clamper unit 170 and the turntable unit 110, the clamper unit 170 and the turntable unit 110 are magnetically adhered (or magnetic force). It is provided for the purpose of suction.

However, in this, the structure to be detected 1
Since the lead portions 140a and 140b of the light emitting element 140A and the light receiving element 140B are bent in a substantially L shape in order to make the light emitting element 140A and the light receiving element 140B face each other, the height of the main board 200 is reduced. Is high with respect to the positions of the light emitting element 140A, the light receiving element 140B, and the structure to be detected 175, and there is a problem in that the height cannot be suppressed to be low and the entire device becomes large.

Further, Japanese Patent Laid-Open No. 8-285877 discloses a turntable rotation speed detection device.
As shown in FIGS. 5A, 5B, and 5C, this is a turntable 201 that rotates by mounting a disc, a drive device that rotates the turntable 201, and the turntable 201. Axis 201a of 201
A cylinder 204 having a cylindrical surface coaxial with and having a plurality of grooves 204a formed at equal intervals in the circumferential direction of the cylindrical surface;
4, the light emitting element 203a and the light receiving element 20 which are placed in the vicinity of 4
And an optical sensor 3 having 3b. However, in this case, since the light emitted from the light emitting element 203a may be diffusely reflected by the groove 204a of the cylinder 204 and a part of the light emitted may be detected by the light receiving element 203b, the turn to which the cylinder 204 is attached is changed. Table 2
There is a problem that the number of revolutions of 01 may not be accurately detected.

[0011]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and can accurately detect the rotation pulse of the rotating body directly connected to the turntable for setting the disc, and moreover, the light emitting element and the light emitting element. The light receiving element can be disposed at substantially the same height as the rotating body, the height of the entire mechanism can be suppressed to a low level, and the entire device including this mechanism can be downsized. Is intended to provide.

[0012]

The present invention has been proposed to solve the above problems. According to a first aspect of the present invention, a crown-shaped intermittent rib is vertically upwardly provided on a circumferential edge of an upper surface of a rotating body having a disk shape in a plan view, which is detachably arranged on an upper part of a turntable for setting a disk in a disk device. And the crown-shaped intermittent ribs are formed at a pitch of 30 degrees on the circumferential edge of the rotating body,
Yes, no, no, yes, yes, no, no, yes, yes, no, no, and the rotating body is formed on a substrate arranged at substantially the same height as this rotating body. Is disposed in the circular arc-shaped recess, and the leg portion of the light-emitting element is horizontally attached to the circular edge on one side of the circular arc-shaped recess of the substrate, and the other side facing the circular edge on the one side. A light-receiving element is attached to the circumference of the circle with its legs oriented horizontally, and light emitted from the light-emitting element is passed through the gap portions of the plurality of intermittent ribs to be received by the light-receiving element. It is characterized in that it is configured to detect a rotation pulse of a directly connected rotating body.

According to a second aspect of the present invention, a crown-shaped intermittent rib is formed vertically on a circular periphery of one side surface of the disk-shaped rotating body, and the crown-shaped intermittent rib is on one side of the circular periphery. When the intermittent ribs are provided in, the intermittent ribs are not provided on the other side of the circumferential edge facing the intermittent ribs, and a plurality of intermittent ribs are provided at predetermined intervals on the circumferential edge so as to project.
A light emitting element is arranged at a position near the outside on one side of the circumference of the rotating body at a position substantially the same height as that of the rotating body, and a light receiving element is arranged at a position near the outside on the other side of the circumference about the same height as the rotating body. Is arranged at a height position, and light emitted from the light emitting element is passed through the gaps of the plurality of intermittent ribs to be received by the light receiving element to detect the rotation pulse of the rotating body. It has a feature.

According to a third aspect of the present invention, the position of the intermittent rib in the rotating body is 3 in the circumferential edge of the rotating body.
Yes, Yes, No, No, Yes, Yes, No, No, Yes, at 0 degree pitch
It is characterized by being arranged in the presence, absence, and absence. According to a fourth aspect of the present invention, the position of the intermittent ribs in the rotating body is arranged at a pitch of 60 degrees on the circumferential edge of the rotating body in a state of existence, existence, existence, existence, existence, existence. Is characterized by.

According to a fifth aspect of the present invention, the rotating body is
An edge portion of a substrate, which is removably disposed on an upper portion of a turntable for setting a disc in a disc device, and in which the light emitting element and the light receiving element are arranged so as to surround the outside of the vicinity of the outside of the rotating body. It is characterized in that its legs are attached horizontally. According to a sixth aspect of the invention, when the rotating body and the turntable are directly connected, the disc set on the turntable is sandwiched between the upper surface of the turntable and the lower surface of the rotating body. It is characterized by being configured in.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a rotation pulse detecting mechanism according to the present invention will be described below with reference to the drawings. FIG. 1 is a partial vertical cross-sectional view of an essential part showing an internal structure of a disk device incorporating a rotation pulse detecting mechanism of an embodiment of the present invention, and FIG. 2 is an inside of a disk device incorporating a rotation pulse detecting mechanism of the embodiment. It is a partial plan view of the main part showing the structure. It should be noted that the same members and the same parts as those in the above-described conventional example will be described with the same reference numerals.

The rotation pulse detecting mechanism of this embodiment is shown in FIG.
As shown in FIG. 1, a turntable 1 provided in a DVD device (disk device) for setting a disk 190
The rotation pulse of the rotating body 1 which is directly connected to the turntable 110 and is detachably connected to the upper part of the rotating body 10 is detected. The DVD device has a substantially box shape, and operation buttons (not shown) such as a Play button, a Stop button, and an Eject button are provided on the front surface thereof. D
A dish portion of a front loading mechanism (not shown) is provided on the front side of the VD device so as to be movable back and forth. An opening is provided in the central area of the plate. On the lower side where the opening is located when the dish is stored in the DVD device, there is a turntable 110 having a substantially two-stage disc shape having a convex portion 110a whose center side is circular in plan view, and this turntable 110. A DC motor 120 for driving the
A vertical movement mechanism (not shown) for vertically moving the two and an optical pickup mechanism (not shown) are provided.

An iron plate 110b is attached to the upper portion of the convex portion 110a of the turntable 110. The rotating body 1 is detachably directly connected to the upper side of the turntable 110.
Also, a strip-shaped chucking plate 180 for rotatably holding the rotating body 1 is provided. Rotating body 1
A main substrate 200 of the DVD device is provided on the upper side of the. On the main board 200, circuits such as a control unit for controlling and driving the entire DVD apparatus, and a light emitting element 2 and a light receiving element 3 described later are mounted. The main board 200 and the plate 180 are fixed to a chassis (not shown) of the DVD device.

The rotation pulse detecting mechanism is provided on the main board 200.
It is composed of a light emitting element 2, a light receiving element 3 and a rotator 1 which are fixed to each other by soldering. The rotating body 1 is formed in a disk shape, and the crown-shaped intermittent ribs 10 are formed vertically on the circumferential edge of the upper side surface of the rotating body 1. When the intermittent ribs 10 are provided on one side, the intermittent ribs 10 are not provided on the other side of the circumferential edge facing the intermittent ribs 10, and a plurality of intermittent ribs 10 are provided at predetermined intervals on the circumferential edge. , With a pitch of 30 degrees around the circumference of the rotating body 1, Yes, Yes, No, No, Yes, Yes, No, No,
It is arranged in the presence, presence, absence, and nothing state. The rotating body 1
The positions of the intermittent ribs 10 in the above may be arranged at a pitch of 60 degrees on the circumferential edge of the rotating body 1 in a state of existence, existence, existence, existence, existence, or absence.

The rotating body 1 is arranged above the turntable 110 for setting the disc 190 in the DVD device, and the convex portion 1 of the turntable 110 is provided.
The magnet 12 embedded in the lower surface recessed portion 11 so as to be in close contact with the iron plate 110b on the upper part of 10a is made detachable, and the light emitting element 2 and the light receiving element 3 are arranged so as to surround the outside of the vicinity of the outside of the rotating body 1. Arc-shaped recess 2
01 on the edge of the main board 200 having its legs 21,
31 is mounted horizontally, and the light emitted from the light emitting element 2 is passed through the gaps of the intermittent ribs 10 of the rotating body 1 and is received by the light receiving element 3, so that the rotation is directly connected to the turntable 200. The rotation pulse of the body 1 is detected.

When the rotary body 1 and the turntable 110 are directly connected, the disc 190 set on the turntable 110 is sandwiched between the upper surface of the turntable 110 and the lower surface of the rotary body 1. ing. According to the rotation pulse detection mechanism of this embodiment, the disk 19
The rotation pulse of the rotary body 1 directly connected to the turntable 110 for setting 0 can be accurately detected, and the light emitting element 2 and the light receiving element 3 are arranged at substantially the same height as the rotary body 1. As a result, the height of the entire mechanism can be kept low, and the entire DVD device equipped with this mechanism can be downsized.

[0022]

As described above, according to the first aspect of the present invention, the upper surface of the rotating body having a disk shape in a plan view, which is detachably disposed on the upper part of the turntable for setting the disk in the disk device. The crown-shaped intermittent rib is formed vertically upward on the circumference of the circle, and this crown-shaped intermittent rib is
Yes, Yes, No, with a pitch of 30 degrees around the circumference of the rotating body
No, Yes, Yes, No, No, Yes, Yes, Yes, No, No, and the rotating body is an arcuate concave formed on the substrate placed at almost the same height as this rotating body. The light-emitting element is arranged inside the arc-shaped recess of the substrate, and the leg portion of the light-emitting element is horizontally attached to the circular edge on one side, and the light-receiving element is provided on the circular edge on the other side opposite to the circular edge on one side. Has its legs mounted horizontally, and detects the rotation pulse of the rotating body directly connected to the turntable by receiving the light emitted from the light emitting element through the gaps of the intermittent ribs and receiving the light with the light receiving element. With this configuration, the following effects can be obtained.

That is, since the rotation pulse of the rotating body can be accurately detected and the legs of the light emitting element and the light receiving element can be mounted horizontally on the substrate, the substrate and the rotating body are arranged at substantially the same height position. Therefore, the height of the entire mechanism can be kept low, and the disk device can be downsized.

According to a second aspect of the present invention, a crown-shaped intermittent rib is formed vertically on a circular periphery of one side surface of the disk-shaped rotating body, and the crown-shaped intermittent rib is on one side of the circular periphery. When the intermittent ribs are provided on the other side, the intermittent ribs are not provided on the other side of the circumferential edge that faces the intermittent ribs, and a plurality of intermittent ribs are provided at predetermined intervals on the circumferential edge. A light emitting element is arranged at a position near the outer side on one side of the circular edge of the rotating body, and at the same height position as the outer side of the rotating body on the other side of the other side of the circular edge. Since the light emission from the light emitting element is arranged to pass through the gaps of the plurality of intermittent ribs and is received by the light receiving element, the rotation pulse of the rotating body is detected. Play.

That is, the rotation pulse of the rotating body directly connected to the turntable for setting the disc can be accurately detected, and the light emitting element and the light receiving element are arranged at substantially the same height position as the rotating body. As a result, the height of the entire mechanism can be suppressed to a low level, and the entire device equipped with this mechanism can be downsized.

According to a third aspect of the present invention, the position of the intermittent rib in the rotating body is at a pitch of 30 degrees on the circumferential edge of the rotating body, with, with, without, without, with, with, without, without, with, Yes, No,
Since it is placed in a non-existent state, the intermittent ribs do not overlap in the diametrical direction, and the light emission from the light emitting element arranged outside the rotating body can be accurately received by the light receiving element, and the rotation pulse of the rotating body is generated. Can be accurately detected. According to the invention described in claim 4, the position of the intermittent ribs in the rotating body is arranged at a pitch of 60 degrees on the circumferential edge of the rotating body in the presence, absence, presence, absence, presence, and absence states. Since the ribs do not overlap each other in the diameter direction, the light emission from the light emitting element arranged outside the rotating body can be accurately received by the light receiving element, and the rotation pulse of the rotating body can be accurately detected.

According to a fifth aspect of the present invention, the rotating body is detachably disposed on the upper part of the turntable for setting the disc in the disc device, and the light emitting element and the light receiving element are located near the outside of the rotating body. Since the legs are horizontally attached to the edge of the substrate arranged so as to surround the outside of the disk, the height of the mechanism can be kept low, and the disk device can be downsized. . According to a sixth aspect of the present invention, when the rotating body and the turntable are directly connected, the disc set on the turntable is sandwiched between the upper surface of the turntable and the lower surface of the rotating body. Therefore, the disc can be held in a stable state.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional view of a main part showing an internal structure of a disk device in which a rotation pulse detection mechanism according to an embodiment of the present invention is incorporated.

FIG. 2 is a partial plan view of an essential part showing an internal structure of a disk device in which the rotation pulse detection mechanism of the embodiment is incorporated.

FIG. 3 is a partial vertical cross-sectional view showing the internal structure of a disk device incorporating a conventional rotation monitoring mechanism.

FIG. 4 is a partial plan view showing the internal structure of a disk device incorporating a conventional rotation monitoring mechanism.

FIG. 5 shows a conventional turntable rotation speed detection device,
(A) and (b) are the perspective views and a partially enlarged plan view, (c).
FIG. 3 is an explanatory diagram showing a state when the outer peripheral surface of a cylinder is detected by an optical sensor.

[Explanation of symbols]

1 rotating body 10 Crown-shaped intermittent rib 2 light emitting element 21 legs 3 Light receiving element 31 legs 110 turntable 190 discs 200 Main board

Claims (6)

(57) [Claims] 1. A crown-shaped intermittent rib is formed vertically upward on a circumferential edge of an upper surface of a rotating body having a disk shape in a plan view, which is detachably arranged on an upper part of a turntable for setting a disk in a disk device. The crown-like intermittent ribs are arranged at a pitch of 30 degrees around the circumference of the rotating body in a state of existence, existence, existence, nothing, existence, existence, existence, nothing, existence, existence, existence, existence. The rotating body is disposed in an arcuate recess formed in a substrate arranged at substantially the same height as the rotating body, and emits light on the circular periphery of one side of the arcuate recess of the substrate. The element has its legs mounted horizontally,
A light receiving element is horizontally mounted with its leg portion on the other circumferential edge opposite to the one circumferential edge, and the light emitted from the light emitting element is passed through the gap portion of the plurality of intermittent ribs to receive the light. A rotation pulse detecting mechanism configured to detect a rotation pulse of a rotating body directly connected to the turntable by receiving light by an element. 2. A crown-shaped intermittent rib is formed vertically on a circular periphery of one side surface of a disk-shaped rotating body, and the crown-shaped intermittent rib is provided when the intermittent rib is provided on one side of the circular periphery. In addition, a plurality of intermittent ribs are provided at predetermined intervals on the circumferential edge so as not to provide an intermittent rib on the other side of the circumferential edge that faces the circular edge, and one side of the circumferential edge of the rotating body is formed. A light-emitting element is arranged at a position substantially the same height as the rotating body near the outer side, and a light-receiving element is arranged at a position substantially the same height as the rotating body at a position near the outer side on the other side of the circumference.
A rotation pulse detecting mechanism configured to detect a rotation pulse of the rotating body by allowing the light receiving element to receive light emitted from the light emitting element through gaps of the plurality of intermittent ribs. 3. The position of the intermittent rib in the rotary body is a pitch of 30 degrees on the circumferential edge of the rotary body, and
The rotation pulse detection mechanism according to claim 2, wherein the rotation pulse detection mechanism is arranged in a state of no, no, yes, yes, no, no, yes, yes, no, and no. 4. The position of the intermittent rib in the rotating body is a pitch of 60 degrees on the circumference of the rotating body, and
The rotation pulse detection mechanism according to claim 2, wherein the rotation pulse detection mechanism is arranged in a state of being present, not present, and present. 5. The rotating body is removably disposed on an upper portion of a turntable for setting a disc in a disc device, and the light emitting element and the light receiving element surround the outside of a portion near the outside of the rotating body. 5. The rotation pulse detecting mechanism according to claim 2, wherein the legs are horizontally attached to the edge portion of the substrate thus arranged. 6. The disc set on the turntable is configured to be sandwiched between an upper surface of the turntable and a lower surface of the rotary body when the rotary body and the turntable are directly connected to each other. The rotation pulse detection mechanism according to claim 5, wherein the rotation pulse detection mechanism is provided.