JP4036010B2 - Memory card connector chattering detection method, electronic apparatus, and optical disc playback apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a memory card connector chattering detection method, an electronic apparatus, and an optical disk reproducing device, and more particularly, when a memory card having a memory and a contact terminal is mounted and the terminals are in contact with each other, and chattering between the terminals after contact is made. The present invention relates to a memory card connector chattering detection method, an electronic apparatus, and an optical disc reproducing apparatus that control to refrain from sending and receiving signals for a predetermined time from the time when chattering occurs.
[0002]
[Prior art]
The contact structure of the connector in the prior art is, for example, a contact terminal formed by aligning a plurality of flat-shaped terminals on a memory card side connector formed in a stick shape, and a plurality of contacts on the other device side. A connector having a connection terminal having a structure in which a plurality of conductive metal pins that are bent in a letter shape and applied with an urging force to align with a flat contact terminal formed in an individual arrangement state is well known. is there.
[0003]
Since the memory card having the contact terminals of these structures uses data recorded in the memory or already recorded data, if the contact terminal of the memory card is inserted into the medium mounting portion of the device in front of the memory card, the contact terminal becomes the device. It is possible to exchange data by maintaining the electrical connection state in a state where a predetermined urging force is obtained by pushing the side-shaped connection terminal on the side into the inside.
[0004]
[Problems to be solved by the invention]
However, in the structure of the contact terminal of the memory card described in the prior art and the connection terminal on the device side, the memory card is equipped with a highly sophisticated circuit and a memory element with high recording density. However, since it is necessary to easily carry it in a pocket etc. and to insert and remove the memory card, a plurality of simple flat terminals are aligned and the terminal part is exposed. The electrical structure is prevented in consideration of the circuit configuration and the like. Also, the contact structure on the device side is formed by arranging a plurality of connection terminals bent in the above-mentioned character shape or in the shape of an arc in order to achieve the same function in consideration of reduction of the cost of the device. The connection terminal has the structure as described above.
[0005]
In this way, when the flat contact terminal and the square connection terminal come into contact with each other, a stable electrical connection can be made with a constant biasing force applied, but the memory card is mounted. For some reason, especially when moving in the insertion / removal direction, the flat contact terminal slides on the flat contact terminal on the flat contact surface. If macro unevenness occurs, the top of the connection terminal slides on the unevenness, and the electrical contact may be in a non-contact state only temporarily. If an operation such as reading / writing data is performed at that time, there is a problem that the device situation malfunctions.
[0006]
Therefore, after the memory card is mounted on a predetermined device, there is a problem that a chattering phenomenon that occurs when the terminals are in a non-contact state can be detected and solved appropriately.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a memory card chattering detection method, an electronic apparatus, and an optical disc reproducing apparatus according to the present invention are configured as follows.
[0008]
(1) When a memory card having a memory and a contact terminal is inserted into the connector of the device and the contact terminal is electrically connected in a contact state with the connection terminal, and inserted between terminals A memory card connector chattering detection that detects chattering and post-insertion chattering that occurs after the contact terminal is electrically connected in contact with the connection terminal, and generates different detection signals. Method.
(2) The chattering detection method according to (1), wherein the different detection signals are generated based on a clock signal from the controller and a chattering detection signal when chattering occurs.
(3) For the different detection signals, the clock signal from the controller is compared with the chattering detection signal when chattering occurs, and if there is a single match, a single match detection signal for determining chattering after insertion is generated. The chattering detection method according to (2), wherein in the case of two-time coincidence, an N-time coincidence detection signal for determining chattering upon insertion is generated.
[0009]
(4) A device including a connector that is inserted into a memory card having a memory and a contact terminal and electrically connected to the connection terminal, and is inserted into the connector and in contact with the connection terminal. An electronic apparatus comprising: chattering detection means for detecting a chattering generated after electrical connection and chattering generated after electrical connection, and generating different detection signals .
[0010]
(5) An optical disk reproducing means capable of reproducing an optical disk, a memory card including a memory and a contact terminal, and a connector that is inserted and electrically connected to the connection terminal. Characterized by comprising: chattering detection means for detecting a chattering generated after the electrical connection in contact with the connection terminal and a chattering generated after the electrical connection , respectively, and generating different detection signals. Optical disk playback device.
[0011]
In this way, the chattering phenomenon that occurs after the memory card is installed in a given device is detected, and when a chattering phenomenon is detected, the memory card cannot be accessed for a predetermined period of time, thereby preventing malfunction due to chattering. It is possible to improve the reliability of not only the memory card but also the device.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of a memory card chattering detection method, an electronic apparatus, and an optical disc playback apparatus according to the present invention will be described with reference to the drawings.
[0013]
As shown in FIG. 1, an apparatus to which a memory card can be attached is an optical disk reproducing apparatus 11 capable of reproducing a medium such as an optical disk CD (Compact Disk) or DVD (Digital Versatile Disk). Is composed of a main body formed in a box shape, and shows an optical disk mounting unit 12 for mounting an optical disk, a display unit 13 for displaying the mounted state, an operation button 14 for operating playback of the optical disk, and the operation. The lamp 15 and the memory card mounting part 17 for mounting the memory card 16 are provided, and the others are omitted.
[0014]
As shown in FIG. 1, a memory card mechanism unit 18 for mounting a memory card is attached to the memory card mounting unit 17.
[0015]
Here, first, the structure of the memory card 16 will be described. As shown in FIG. 2, the memory card 16 is formed in an elongated stick shape and has a contact portion 19 at one end in the longitudinal direction.
[0016]
2 and 3, the contact portion 19 is formed by arranging a plurality of contact terminals 20 having an elongated flat plate shape in an aligned state, in the case of the embodiment, 10 in an aligned state. The structure is arranged in a depressed state while being covered with the guide frame 21 so as not to contact the adjacent contact terminals 20.
The surface of each contact terminal 20 comes into contact with the connection terminal in an abutting state with an urging force, so that the terminal surface wears unevenly as shown in FIG. 3 during repeated use. The uneven wear surface 22 is formed. The uneven wear surface 22 is usually a linear uneven wear surface 22 along the sliding direction.
[0017]
As shown in FIG. 2, the memory card mechanism portion 18 is formed of a substantially rectangular insulating resin, provided with guide portions 24, 24 at both ends in the short direction, and a conductive member at one end in the longitudinal direction. A base 23 having a terminal portion 25 formed, and a heart cam for inserting and removing the memory card 16 provided inside the base 23 along one guide portion 24 in the short direction by push and push. A heart cam portion 26 having a structure, a cam guide portion 27 and a spring 28 that engage with the heart cam portion 26 to guide the memory card 16 to be attached and detached, and a cam guide portion 27 and a spring 28 from above the base 23 The cover portion 30 is engaged with the claws 29 and 29 in a state where the spring 28 is engaged.
[0018]
As shown in FIGS. 3, 4 and 5, the terminal portion 25 includes connection terminals 31a, 31b, 31c formed by arranging conductive metal pins formed in a square shape in an aligned state. The base portion is provided with a contact portion 25a. The connection terminals 31a, 31b, and 31c are formed from signal connection terminals 31a and 31b that are long at the connection terminals 31c at both ends, sandwiched between the connection terminals 31c at both ends and shorter than the connection terminals 31c at both ends. Thus, of these signal connection terminals 31a and 31b, the connection terminal 31a at the center position is formed in a short dimension and has a structure having a function of a detection terminal for detecting the insertion of the memory card 16.
[0019]
As shown in FIG. 6, the heart cam portion 26 shown in FIG. 2 has a structure in which a heart cam 32 is provided at the center and a plurality of guide grooves having different depression depths are provided so as to surround the heart cam 32.
[0020]
First, the plurality of guide grooves are formed with an inclined groove 33 provided at an outer position of the heart cam 32 for guiding the memory card 16 in the mounting direction, and a stepped portion that is connected to the inclined groove 33 and has a deep depression. A loading guide groove 34, a release groove 35 connected to the loading guide groove 34 and formed with a step with a deep recess, and a connection groove connected to the release groove 35 and formed with a step with a deep recess. The release release groove 36 is formed along the inside of the heart cam 32, and the release release groove 36 is connected to the inclined groove 33.
[0021]
In addition to providing such a guide groove, a connection holding portion 37 formed in a curved shape centered on the heart cam 32 around the heart cam 32, and a loading guide formed facing the connection holding portion 37 diagonally outward. It has a structure in which a portion 38, a connection holding portion 37, and a release guide portion 39 formed so as to face each other in an obliquely inward direction are provided.
[0022]
The loading guide portion 38 is a position when the memory card 16 is inserted and the leading end portion of the memory card 16 comes into contact with the contact portion 25 a of the terminal portion 25, and the connection holding portion 37 contacts the memory card 16. The terminal 20 is a position in a normal connection state where the terminal 20 contacts the connection terminal 31 of the terminal portion 25, and the release guide portion 39 is a position where the tip end portion of the memory card 16 contacts the contact portion 25a to release the connection state. .
[0023]
The cam guide portion 27 shown in FIG. 2 engages with the front end corner of the memory card 16 and guides the memory card 16 in the direction of the terminal portion 25 by pushing the back of the memory card 16, and in conjunction with the heart cam portion 26, 16 is attached when pushed and released when pushed again.
[0024]
The structure includes a key-shaped memory card engagement guide portion 40 that engages with a front end corner of the memory card 16 and a pendulum-shaped guide that is guided in a clockwise direction by being guided by a groove of the heart cam portion 26 on the rear end side. It consists of a convex part 41.
The cam guide portion 27 having such a structure is engaged with a spring 28 disposed in a spring engagement portion 42 provided on the terminal portion 25 side of the base 23 and constantly applies a biasing force in a direction away from the terminal portion 25. It has a structure to do.
[0025]
With reference to FIG. 7, the memory card 16 is inserted into the memory card mechanism portion 18 having such a structure and the contact terminals 20 are electrically connected to the connection terminals 31 of the terminal portions 25 in contact with each other. A description will be given according to the movement of the guide convex portion 41 that moves the heart cam portion 26 shown in FIG.
[0026]
First, as shown in FIG. 7A, when the memory card is inserted and the memory card 16 is pushed in the direction of the terminal portion 25, the guide convex portion 41 exists at the position P1 in FIG. Pushed in 25 directions.
[0027]
Next, as shown in FIG. 7B, the guide convex portion shown in FIG. 6 is further displayed in a state where the memory card 16 is pushed and the contact terminal 20 of the memory card 16 contacts the connection terminal 31b of the terminal portion 25. 41 moves to the position P2.
[0028]
Next, as shown in FIG. 7C, when the memory card 16 is further pushed and pushed until it comes into contact with the contact portion 25a, the guide convex portion 41 in FIG. The connection terminal 20 comes into contact with the position in the back direction of 31b.
[0029]
When the force for pushing the memory card 16 is released in this state, as shown in FIG. 7D, the force is pushed back by the force of the spring 28, and the guide convex portion 41 shown in FIG. 6 is engaged by the connection holding portion 37 at the position P4. Stop. At this time, there is a contact portion at the apex of the connection terminals 31a and 31b having a square shape at a substantially middle position of the contact terminal 20 of the memory card 16, and the contact is made in the most stable state.
[0030]
In this state, the memory card 16 is urged away from the terminal portion 25 by the spring 28 of the cam guide portion 27, but the guide convex portion 41 is engaged with the connection support portion 37 of the heart cam 32. If the memory card 16 is not pushed from the outside, the contact terminal 20 is connected to the connection terminals 31a and 31b in a stable state.
[0031]
However, when the memory card 16 is pushed from the outside, the guide convex portion 41 is configured to move from the position P4 to the position P5 in FIG. This is also because the span between the position P4 and the position P5 is in a state where the memory card 16 can move in the connected state, and the force that moves only between the position P4 and the position P5 is the memory card 16 In addition, the connection terminals 31a and 31b are slid by the distance in contact with the contact terminal 20, which is one factor that causes chattering. This is because, as shown in FIG. 3, if the terminal surface of the contact terminal 20 is an uneven wear surface 22, the tops of the connection terminals 31 a and 31 b slide on the uneven wear surface 22. This is because there may be a non-contact state.
[0032]
FIG. 8 illustrates the element that causes chattering. First, when the memory card 16 is engaged with the cam guide portion 27 immediately after the insertion, it is still connected to the contact terminal 20. Terminals 31a and 31b are not connected. If the terminals contact each other by pushing the back of the memory card 16 by hand, the contact state is unstable because the apex portions of the connection terminals 31a and 31b slide on the upper part of the contact terminal 20 because the terminals do not stop on the spot. It becomes a state. Then, when the inserted state is completed and the connection holding portion 37 of the heart cam 32 is engaged, the movement of the terminals disappears and the stable state is obtained. By detaching from the connection holding portion 37, the terminals slide and move while in contact with each other, so that an unstable state, i.e., chattering is likely to occur, and if the terminals move rearward along the heart cam 32, the terminals are moved to each other. It becomes a non-contact state and escapes from an unstable state.
[0033]
In this way, even when the terminals are in contact with each other, there is a clearance for removal, so sliding between the terminals between the clearances is a factor that causes chattering.
[0034]
9 and 10 show a circuit and a detection method for detecting and preventing chattering after insertion that occurs after the terminals are in contact with each other, in addition to preventing chattering at the time of insertion. Is represented by a timing chart.
[0035]
The circuit shown in FIG. 9 has a circuit configuration in which a multivibrator 45 and an AND circuit 46 connected to the detection terminal 31a of the terminal portion 25 are combined. The multivibrator 45 includes a resistor R and a capacitor Cc that set a constant time constant, and is configured to set a stable period when chattering occurs.
[0036]
In order to detect chattering in such a circuit, first, when the insertion detection terminal 31a of the “A signal” contacts the detection terminal 31a with the contact terminal 20 of the memory card 16, the signal goes low, and the multivibrator 45 The “B signal” is set to low for a predetermined time. By doing so, the chattering pulse signal P1 when the contact terminal 20 is inserted can be ignored.
[0037]
If the contact state is stable in this state, there is no problem, but if the memory card 16 is subjected to insertion / removal or a malicious operation, as shown in FIG. In addition, when the contact terminal 20 has an uneven wear surface 22, the contact state is changed to the non-contact state, and so-called chattering occurs after insertion.
[0038]
This post-insertion chattering can be detected by detecting a rectangular wave pulse signal P2 generated when the “A signal” is in a contact state and keeps low.
That is, the chattering detection signal which is the output signal of the AND circuit 46 is provided on the condition that the “A signal” becomes high and the “B signal” of the output signal of the multivibrator 45 is high, when this pulse signal is generated. It can be detected that (C signal) becomes high and chattering has occurred.
[0039]
Further, when the first pulse signal P2 of chattering after insertion becomes low, the multivibrator 45 is driven to generate a low signal for a certain period, whereby the chattering detection signal (“C signal” of the output signal of the AND circuit 46 is generated. )) Becomes high, and if it is detected that the chattering detection signal becomes high, access to the memory card 16 during that time can be restricted.
[0040]
Further, these “A signal”, “B signal”, and “C signal” are synchronized with a clock (INS detection signal) of a controller (not shown) so that the contact terminal 20 and the connection terminals 31a and 31b are in contact with each other. It is possible to detect chattering after the occurrence of insertion (single coincidence detection signal). In addition, when the “A signal” becomes key-pro, the chattering at the time of insertion, for example, if a pulse signal is generated three times, this is set to a three-time coincidence detection signal that detects chattering at the time of insertion. Therefore, if the low state of this signal is detected, it can be determined that the current chattering is chattering at the time of insertion.
[0041]
In this way, chattering can be detected with a simple hardware circuit configuration and can be detected in software, and chattering can be detected more reliably by combining these detection states. It is.
[0042]
【The invention's effect】
As described above, the memory card connector chattering detection method, the electronic apparatus, and the optical disc playback apparatus according to the present invention detect chattering that occurs when a memory card is inserted and removed, and also detect chattering when the memory card is inserted. Thus, it is possible to avoid malfunction during operation of the memory card and to improve the performance of the device.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram schematically showing an apparatus provided with a memory card chattering detection method according to the present invention.
FIG. 2 is an overall configuration diagram showing an exploded unit mechanism unit for mounting the memory card.
FIG. 3 is an explanatory diagram showing an enlarged terminal surface of the memory card.
FIG. 4 is a perspective view of an essential part of a terminal portion of the unit mechanism portion.
FIG. 5 is a plan view of an essential part of a terminal portion of the unit mechanism portion.
FIG. 6 is a perspective view of a main part of a heart cam portion of the unit mechanism portion.
FIG. 7 is an explanatory diagram showing a state in which a terminal of a memory card is connected to a terminal portion of a unit mechanism portion.
FIG. 8 is an explanatory diagram showing how chattering occurs.
FIG. 9 is an explanatory diagram showing a circuit configuration for detecting chattering.
FIG. 10 is a timing chart according to a circuit configuration for detecting chattering.
[Explanation of symbols]
11; optical disk playback device, 12; optical disk mounting unit, 13; display unit, 14; operation button, 15; lamp, 16; memory card, 17; memory card mounting unit, 18; 20; contact terminal, 21; guide frame, 22; uneven friction surface, 23; base, 24; guide portion, 25; terminal portion, 25a; contact portion, 26; Spring, 29; Claw, 30; Cover part, 31; Connection terminal, 31a; Connection terminal (detection terminal), 31b; Connection terminal (for signal), 31c; Connection terminal, 32: Her and cam, 33; , 34; loading guide groove, 35; release groove, 36; release release groove, 37; connection holding portion, 38; loading guide portion, 39; release guide portion, 40; memory card engagement guide portion, 41; 45; Multivibrator 46; AND circuit.

Claims (5)

Chattering at the time of insertion between terminals generated when a memory card provided with a memory and a contact terminal in the device is inserted into a connector of the device and the contact terminal is electrically connected in a contact state with the connection terminal; A memory card connector chattering detection method for detecting chattering after insertion that occurs after the contact terminals are electrically connected to the connection terminals in contact with each other, and generating different detection signals .   2. The memory card connector chattering detection method according to claim 1, wherein the different detection signals are generated based on a clock signal from the controller and a chattering detection signal when chattering occurs.   For the different detection signals, the clock signal from the controller is compared with the chattering detection signal when chattering occurs. If there is a single match, a single match detection signal for determining chattering after insertion is generated. 3. The memory card connector chattering detection method according to claim 2, further comprising: generating an N-time coincidence detection signal for determining chattering at the time of insertion. A device having a connector for inserting a memory card including a memory and a contact terminal to be electrically connected to the connection terminal, wherein the memory card is electrically inserted in the connector and in contact with the connection terminal. An electronic apparatus comprising: chattering detection means for detecting a chattering that occurs when a connection is made and chattering that occurs after the connection is established, and generating different detection signals . An optical disk reproducing means capable of reproducing an optical disk, a memory card including a memory and a contact terminal, and a connector that is inserted and electrically connected to the connection terminal, and is inserted into the connector and the connection terminal An optical disc reproduction comprising: chattering detection means for detecting a chattering that occurs when the electrical connection is made in a contact state and chattering that occurs after the electrical connection is made, and that generates different detection signals. apparatus.

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