KR100230293B1 - Method for discriminating top/end of tape in an image recording/reproducing apparatus - Google Patents

Abstract

A tape top / end discriminating method in a video signal recording / reproducing apparatus according to the present invention comprises the steps of: determining whether a capstan motor is rotating; Determining whether the capstan motor is rotating at FF (REW) speed; Determining whether the tape end (top) deceleration flag is FF (REW) speed; Checking a slow forward (reverse) tape end (top) if the tape end (top) slowdown flag is present; Determining whether the tape supply (rewind) reel pulse count value is a predetermined number of times unless the tape end (top) deceleration flag; Determining whether the number of FGs of the capstan motor is equal to or less than a set reference value; And setting a tape end (top) deceleration flag.

According to the present invention as described above, since the top / end of the tape can be determined without using the LED and the photo sensor as in the prior art, it is possible to reduce the production cost of the product according to the reduction of the parts cost, and to shorten the assembly process time to improve the productivity of the product There is an advantage that can be improved.

Description

Tape Top / End Discrimination Method in Video Signal Recording / Playback Equipment

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape top / end discriminating method in a video signal recording / reproducing apparatus, and in particular, a generation frequency of a capstan motor corresponding to a pulse of a tape reel (abbreviated as CFG). A tape top / end discriminating method in a video signal recording / reproducing apparatus for counting the number of times to discriminate the tape top / end.

Mechanisms for recording information on the magnetic tape by rotating head drums or for reproducing the recorded information from the magnetic tape include a video cassette recorder (VCR), a video camera (also called a camcorder), and a digital audio tape recorder (R-DAT). It can be seen from the back. The deck mechanisms installed thereon include a cassette loading mechanism for transporting the tape cassette to a predetermined position on the deck, and two tape reels in the conveyed cassette each seated and one of the two tape reels selectively driven to wind the tape. Two reel driving tables, brake means for selectively braking the two reel driving tables, a tape loading mechanism for loading a tape into the head drum, a tension pole mechanism for pressing the loaded tape to maintain tension; And pinch roller drive means for crimping the tape between the capstan motor shaft and the pinch roller, and at least one guide means for guiding the running tape.

On the other hand, such a deck mechanism typically performs a function such as basic recording / playback (REC / PLAY) and fast fast forward / rewind (FF / REW) by changing a state of each part of the deck by a predetermined control program. Of course, it performs the functions such as playback of still and slow pictures, high-speed search and reverse playback, which are selectively added according to the product.

1 and 2 show the deck mechanism of the conventional video camera, Figure 1 is an exploded perspective view of the entire deck, Figure 2 is a perspective view of the sub deck of the entire deck of FIG.

1 and 2, the deck mechanism of a conventional video camera is largely coupled to the deck 11 forming the base of the device, and the cassette housing for guiding the insertion and ejection of the cassette by being coupled to the upper portion of the deck 11 ( 20).

The deck 11 includes a reel driving table 12s and 12t for driving a tape reel inside a cassette (not shown) inserted into the apparatus, and a head (not shown) for reading information from or writing information to the tape. A head drum 13 having a c) is provided. In addition, the pole base assembly 14s and 14t for loading and unloading the tape into the head drum 13 and the pole base assembly 14s and 14t along a predetermined movement trajectory. A loading motor 15 that provides a driving force for reciprocating movement, a capstan motor 16 for traction the tape to provide a driving force to the tape, and a tape in close contact with the axis of the capstan motor 16 for relative rotational movement. Pinch roller 17 for crimping and transferring the cassette and a cassette tape which is mounted and driven on the reel driving tables 12s and 12t while sensing the presence / absence of the cassette when the housing 20 is closed or when the power is turned on. LEDs 18 emitting light as a means for sensing the top / end of the light and photosensors 19a and 19b for sensing the light transmitted through the transparent portion of the top / end area of the tape. ) Is installed. In the cassette housing 20, first and second arm members 21a and 21b for raising / lowering operation of the housing 20 are alternately installed on both sides of the housing in an X-shape. In FIG. 2, reference numeral 11s denotes a sub deck.

By the way, the conventional video camera having the above-described configuration is provided with LEDs 18 and photo sensors 19a and 19b as a means for detecting the top / end of the tape as described above, so that the deck is assembled very precisely. There is a problem that the technical difficulties that must be accompanied, resulting in a longer assembly process time, the productivity of the product is lowered, reducing the competitiveness of the product due to the cost increase according to the parts cost.

The present invention has been made in view of the above problems, and in a video signal recording / reproducing apparatus capable of controlling the operation of the deck assembly by detecting the presence / absence and position of the tape without a sensor for detecting the start and end of the tape. Its purpose is to provide a tape top / end discrimination method.

1 is an exploded perspective view showing a deck mechanism of a conventional video camera.

FIG. 2 is a perspective view of the sub deck of the deck mechanism of FIG. 1. FIG.

3 is a perspective view of a sub deck of a video camera employing a tape top / end discriminating method in a video signal recording / reproducing apparatus according to the present invention.

4A and 4B are flowcharts showing an execution process of a tape top / end discriminating method in a video signal recording / reproducing apparatus according to the present invention.

Fig. 5 is a flowchart showing a process of checking a low speed FWD tape end in a tape top / end discriminating method in a video signal recording / reproducing apparatus according to the present invention.

Fig. 6 is a flowchart showing a process of checking a low speed RVS tape top in the tape top / end discriminating method in the video signal recording / reproducing apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

11: Deck 12s, 12t, 32s, 32t: Reel Drive Table

13: Head drum 14s, 14t, 34s, 34t: Pole base assembly

15: loading motor 16: capstan motor

17,37: pinch roller 18: LED

19a, 19b: photo sensor 20: housing

21a: first arm member 21b: second arm member

11s, 31s: sub deck

In order to achieve the above object, a tape top / end discriminating method in a video signal recording / reproducing apparatus according to the present invention,

a) determining whether the capstan motor is rotating;

b) determining whether the capstan motor is in the forward rotation in step a);

c) determining whether the speed of the capstan motor is FF speed (or FPS) when the motor rotates forward in step b);

d) determining whether the tape end deceleration flag is set if the speed of the capstan motor is FF times in step c);

e) checking a slow forward (FWD) tape end if the tape end slowdown flag in step d);

f) determining whether the tape feed reel pulse count value is a predetermined number of times unless the tape end deceleration flag in step d);

g) accumulating the FG number of the capstan motor if the tape supply reel pulse count value in step f) is not a predetermined number;

h) starting the tape feed reel pulse count if the tape feed reel pulse count value in step f) is a predetermined number of times;

i) determining whether the number of FGs of the capstan motor is equal to or less than a set reference value;

j) increasing the tape supply reel pulse count reference value if the number of FGs of the capstan motor is less than or equal to the set reference value in step i);

k) determining whether the tape supply reel pulse count reference value is a predetermined number of times;

l) setting the tape end deceleration flag if the tape supply reel pulse count reference value in step k) is a predetermined number;

m) slowing the capstan motor at a predetermined double speed;

n) setting the tape feed reel pulse count reference value to zero;

o) if the capstan motor is not rotated forward in step b), determining whether the speed of the capstan motor is REW speed;

p) if the speed of the capstan motor in the step o) is REW speed (or RPS), determining whether it is a tape top deceleration flag;

q) checking a low speed reverse (RVS) tape top if the tape top deceleration flag in step p);

r) if the tape top deceleration flag is not in step p), determining whether the pulse count value to be tape wound is a predetermined number of times;

s) accumulating the FG number of the capstan motor if the pulse counting value to be tape wound in step r) is not a predetermined number of times;

t) starting the tape winding pulse count if the tape winding pulse counting value in the step r) is a predetermined number of times;

u) determining whether the number of FG of the capstan motor is equal to or less than a set reference value;

v) increasing the tape count pulse count reference value if the FG count of the capstan motor is less than or equal to the set reference value in step u);

w) determining whether a pulse count reference value to be tape wound is a predetermined number of times;

x) setting a tape top deceleration flag if the pulse count reference value to be tape wound in step w) is a predetermined number;

y) decelerating the capstan motor at a predetermined double speed; And

z) setting the tape feed reel pulse count reference value to zero.

Here, the slow forward (FWD) tape end checking of step e),

e-1) determining whether a tape feed reel pulse edge has occurred;

e-2) if the tape feed reel pulse edge has occurred in step e-1), setting a reel timer to an initial state;

e-3) if the tape supply reel pulse edge has not occurred in step e-1), determining whether the set reel timer time is reached; And

e-4) It is characterized in that it comprises the step of setting a tape end flag when the set reel timer time has been reached.

Further, the low speed reverse (RVS) tape top checking of step q),

q-1) determining whether a pulse edge to tape winding has occurred;

q-2) setting the reel timer to an initial state if a tape winding pulse edge occurs in step e-1);

q-3) if the tape reel pulse edge has not occurred in step e-1), determining whether the set reel timer time is reached; And

q-4) It is characterized in that it comprises the step of setting a tape top flag when the set reel timer time has been reached.

According to the present invention as described above, since the top / end of the tape can be determined without using the LED and the photo sensor as in the prior art, it is possible to reduce the production cost of the product according to the reduction of the parts cost, and to shorten the assembly process time to improve the productivity of the product There is an advantage that can be improved.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a perspective view of a sub deck of a video camera employing a tape top / end discriminating method in a video signal recording / reproducing apparatus according to the present invention.

As shown in Fig. 3, the sub-deck 31s of the video camera employing the tape top / end discriminating method in the video signal recording / reproducing apparatus according to the present invention has a conventional LED for detecting the top / end of the tape. 18 and the photo sensors 19a and 19b are not provided. The method of the present invention uses the number of FGs generated from the capstan motor to determine the top / end of the tape instead of using such LEDs 18 and photo sensors 19a and 19b. In Fig. 3, reference numerals 32s and 32t denote reel driving tables, 34s and 34t denote pole base assemblies, and 37 denote pinch rollers, respectively.

Next, a process of discriminating the tape top / end by the tape top / end discriminating method in the video signal recording / reproducing apparatus according to the present invention will be described with reference to FIGS. 4A to 6.

4A and 4B are flowcharts showing an execution process of a tape top / end discriminating method in a video signal recording / reproducing apparatus according to the present invention, and FIG. 5 is a tape top / end discriminating method according to the present invention. Fig. 6 is a flow chart showing a tape end checking method in a double speed reduction mode, a normal search, and a PB. FIG. 6 shows a tape top checking in a triple speed reduction mode, a normal search, and a PB in a tape top / end discrimination method according to the present invention. A flow chart showing the method.

4A and 4B, the tape top / end discriminating method in the video signal recording / reproducing apparatus according to the present invention first determines whether the capstan motor is rotating (step 401). If the capstan motor is not rotating in this step 401, it is not a function of checking the top / end of the tape, and thus the tape top / end discrimination program ends immediately. If the capstan motor is rotating in step 401, it is determined whether the rotation of the capstan motor is forward rotation (step 402). If forward rotation is performed in this step 402, it is determined whether the double speed of the capstan motor is FF (fast forward) speed (or FPS) (step 403). If the speed of the capstan motor is FF speed (or FPS) in this step 403, it is determined whether it is a tape end deceleration flag (step 404). In this step 404, if the tape end deceleration flag is checked, a slow forward (FWD) tape end is checked (step 405). Here, such checking is performed even when the speed of the capstan motor is not FF speed in step 403. In step 404, if the tape end deceleration flag is not determined, it is determined whether the tape supply reel pulse count value is six times (step 406). If the tape supply reel pulse count value is not six times in step 406, the FG number of the capstan motor is accumulated (step 407), and the program is terminated. If the tape feed reel pulse count is 6 times in step 406, the tape feed reel pulse count is started (step 409). Then, it is determined whether the number of FGs of the capstan motor is equal to or less than the set reference value (step 409). If the FG count of the capstan motor is less than or equal to the set reference value in step 409, the tape feed reel pulse count reference value is increased (step 410). Then, it is determined whether the tape supply reel pulse count reference value is three times (step 411). If the tape feed reel pulse count reference value is three times in this step 411, the tape end deceleration flag is set (step 412), the capstan motor is decelerated at triple speed (step 413), and the tape feed reel pulse count reference value is set to 0. (Step 414). This ends the tape end determination program. If the number of FGs of the capstan motor is not less than or equal to the set reference value in step 409, the tape supply reel pulse count reference value is set to 0. In step 411, the tape supply reel pulse count is set. If the reference value is not three times, the tape end discrimination program ends immediately.

On the other hand, if the capstan motor does not rotate forward in step 402, it is determined whether the speed of the capstan motor is REW (rewinding) speed (or RPS) (step 415). If the speed of the capstan motor is REW speed (or RPS) in step 415, it is determined whether it is a tape top deceleration flag (step 416). If the tape top deceleration flag is found in this step 416, a low speed reverse (RVS) tape top is checked (step 417). Here, the low speed reverse (RVS) tape top is checked even when the speed of the capstan motor is not the REW speed in step 415. If it is not the tape top deceleration flag in step 416, it is determined whether the pulse count value to be tape wound is six times (step 418). If the pulse counting value to be tape wound at step 418 is not six times, the FG count of the capstan motor is accumulated (step 419), and the tape top determination program is terminated. When the tape counting pulse counting value is 6 times in step 418, the tape counting pulse winding count is started (step 420). Then, it is determined whether the number of FG of the capstan motor is equal to or less than the set reference value (step 421). If the FG count of the capstan motor is less than or equal to the set reference value in this step 421, the pulse counting reference value for winding the tape is increased (step 422). Then, it is determined whether the pulse count reference value for tape winding is three times (step 423). If the pulse count to be taped in this step 423 is three times, the tape top deceleration flag is set (step 424). Thereafter, the capstan motor is decelerated at three times the speed (step 425), and then the tape supply reel pulse count reference value is set to 0 (step 426). In this way, the tape top determination program is terminated. If the FG count of the capstan motor is not equal to or less than the set reference value in step 421, the tape supply reel pulse count reference value is set to 0. In step 423, if the tape reel pulse count reference value is not three times, the tape immediately The top determination program ends.

Here, the process of checking the low speed forward (FWD) tape end of the step 405 will be described in more detail, as shown in FIG. 5, and it is first determined whether a tape supply reel pulse edge has occurred (step 501). If a tape feed reel pulse edge has occurred in this step 501, the reel timer is set to an initial state (step 502), and the program ends. If the tape supply reel pulse edge has not occurred in step 501, it is determined whether the set reel timer time has elapsed (step 503). In this determination, the program ends immediately if the set reel timer time has not elapsed. If the set reel timer time has elapsed, the tape end flag is set (step 504) and the program ends. The tape end checking method as described above is applied when checking the tape end in the triple speed deceleration mode, normal search, and PB.

In addition, the process of checking the low speed reverse (RVS) tape top of the step 417 will be described in more detail. As shown in FIG. 6, it is first determined whether a pulse edge for tape winding is generated (step 601). If a tape winding pulse edge has occurred in this step 601, the reel timer is set to an initial state (step 602), and the program ends. If the tape reel pulse edge has not occurred in step 601, it is determined whether the set reel timer time has elapsed (step 603). In this determination, if the set reel timer time has not elapsed, the program ends immediately. If the set reel timer time has elapsed, the tape top flag is set (step 604), and the program ends. The tape top checking method as described above is applied when checking the tape top in the triple speed reduction mode and normal search.

As described above, the tape top / end discriminating method of the video signal recording / reproducing apparatus according to the present invention discriminates the tape top / end without using the LED and the photo sensor as in the prior art, thereby producing a product according to the reduction of the part cost. The cost can be lowered and the assembly process time can be shortened to improve the productivity of the product.

Claims (16)

a) determining whether the capstan motor is rotating; b) determining whether the capstan motor is in the forward rotation in step a); c) determining whether the speed of the capstan motor is FF speed (or FPS) when the motor rotates forward in step b); d) if the speed of the capstan motor is FF times (or RPS) in step c), determining whether the tape end deceleration flag is present; e) checking a slow forward (FWD) tape end if the tape end slowdown flag in step d); f) determining whether the tape feed reel pulse count value is a predetermined number of times unless the tape end deceleration flag in step d); g) accumulating the FG number of the capstan motor if the tape supply reel pulse count value in step f) is not a predetermined number; h) starting the tape feed reel pulse count if the tape feed reel pulse count value in step f) is a predetermined number of times; i) determining whether the number of FGs of the capstan motor is equal to or less than a set reference value; j) increasing the tape supply reel pulse count reference value if the number of FGs of the capstan motor is less than or equal to the set reference value in step i); k) determining whether the tape supply reel pulse count reference value is a predetermined number of times; l) setting the tape end deceleration flag if the tape supply reel pulse count reference value in step k) is a predetermined number; m) slowing the capstan motor at a predetermined double speed; n) setting the tape feed reel pulse count reference value to zero; o) if the capstan motor is not rotating forward in step b), determining whether the capstan motor speed is REW speed (or RPS); p) if the speed of the capstan motor in the step o) is REW speed (or RPS), determining whether it is a tape top deceleration flag; q) checking a low speed reverse (RVS) tape top if the tape top deceleration flag in step p); r) if the tape top deceleration flag is not in step p), determining whether the pulse count value to be tape wound is a predetermined number of times; s) accumulating the FG number of the capstan motor if the pulse counting value to be tape wound in step r) is not a predetermined number of times; t) starting the tape winding pulse count if the tape winding pulse counting value in the step r) is a predetermined number of times; u) determining whether the number of FG of the capstan motor is equal to or less than a set reference value; v) increasing the tape count pulse count reference value if the FG count of the capstan motor is less than or equal to the set reference value in step u); w) determining whether a pulse count reference value to be tape wound is a predetermined number of times; x) setting a tape top deceleration flag if the pulse count reference value to be tape wound in step w) is a predetermined number; y) decelerating the capstan motor at a predetermined double speed; And and z) setting the tape supply reel pulse count reference value to 0. A tape top / end discrimination method in a video signal recording / reproducing apparatus. The method of claim 1, The slow forward (FWD) tape end checking of step e), e-1) determining whether a tape feed reel pulse edge has occurred; e-2) if the tape feed reel pulse edge has occurred in step e-1), setting a reel timer to an initial state; e-3) if the tape supply reel pulse edge has not occurred in step e-1), determining whether the set reel timer time is reached; And e-4) A tape top / end discrimination method in a video signal recording / reproducing apparatus, comprising the step of setting a tape end flag when the set reel timer time has elapsed. The method of claim 1, The low speed reverse (RVS) tape top checking of step q), q-1) determining whether a pulse edge to tape winding has occurred; q-2) setting the reel timer to an initial state if a tape winding pulse edge occurs in step e-1); q-3) if the tape reel pulse edge has not occurred in step e-1), determining whether the set reel timer time is reached; And q-4) A tape top / end discrimination method in a video signal recording / reproducing apparatus, comprising the step of setting a tape top flag when the set reel timer time is reached. The method of claim 1, And determining whether the tape supply reel pulse count value is six times in step f). The method of claim 1, In step k), it is determined whether the tape supply reel pulse count reference value is three times. A tape top / end discriminating method in a video signal recording / reproducing apparatus. The method of claim 1, A tape top / end discriminating method in a video signal recording / reproducing apparatus, characterized in that the capstan motor is decelerated at 3 times the speed in m. The method of claim 1, And determining whether the pulse counting value to be tape rewound is six times in step r). The method of claim 1, And determining whether the pulse count to be tape wound is three times in step w). The method of claim 1, Tape top / end discrimination method in the video signal recording / reproducing apparatus, characterized in that in step y) the capstan motor is decelerated at three times speed. The method of claim 1, If the capstan motor is not rotating in the step a), the tape top / end discrimination method in the video signal recording / reproducing apparatus characterized in that it recognizes as a tape top or end state. The method of claim 1, And checking the low speed FWD tape end when the speed of the capstan motor is not FF speed in step c). The method of claim 1, And a tape supply reel pulse count reference value is set to 0 when the number of FGs of the capstan motor is not equal to or less than the set reference value in step i). The method of claim 1, And if the tape supply reel pulse count reference value is not three times in step k), the tape end / end discrimination method of the video signal recording / reproducing apparatus is finished. The method of claim 1, And checking the low speed reverse (RVS) tape top when the speed of the capstan motor is not REW speed in step o). The method of claim 1, And a tape supply reel pulse count reference value is set to 0 when the number of FGs of the capstan motor is not equal to or less than the set reference value in step u). The method of claim 1, And a tape top discrimination program is terminated immediately if the pulse count reference value for tape winding in step w) is not three times.

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