JP3785636B2 - Tape type discriminating apparatus and tape type discriminating method for information recording / reproducing apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an information recording / reproducing apparatus having a high-speed winding mode in addition to a normal winding mode, and more specifically, in a high-speed rewinding mode (high-speed REW mode), The present invention relates to a tape type discriminating apparatus and a tape type discriminating method for an information recording / reproducing apparatus capable of discriminating a VHS-C tape cassette (hereinafter also referred to as C cassette type) which is a non-standard tape cassette.
[0002]
[Prior art]
Recent video cassette recorders are provided with a high-speed winding mode in addition to the normal winding mode in order to perform tape winding faster.
[0003]
The high-speed take-up mode is a mode in which the take-up speed at the time of fast feed (FF time) and rewind (REW time) is changed in a plurality of stages depending on the type of tape cassette (that is, reel hub diameter) and the remaining amount of tape. With a 120 minute tape, the tape can be wound in about 1 minute from the beginning to the end of the tape.
[0004]
In addition, there are 62mm thick hub type and 26mm thin hub type in reel hub diameter. Generally, 30min tape and 60min tape are thick hub type, 90min tape and 120min tape are thin hub type. It has become.
[0005]
In high-speed take-up mode, the tape take-up speed control method differs depending on the reel hub diameter difference (thick hub type and thin hub type), so when the tape cassette is loaded into the main body and the first take-up mode is executed Therefore, it is necessary to determine the reel hub diameter.
[0006]
The conventional reel hub diameter is determined based on the calculation value A of the following calculation formula (1).
[0007]
Tt ** 2 + Ts ** 2 = A (**: exponentiation) (1)
[0008]
Where Tt is the reel pulse cycle of the take-up reel, and Ts is the reel pulse cycle of the supply reel.
[0009]
In other words, the expression (1) is an arithmetic expression for obtaining the sum of the square of one rotation period of the supply-side reel and the square of one rotation period of the take-up reel.
[0010]
This value A is an eigenvalue determined by the type of tape cassette (thick hub type, thin hub type, C cassette type, etc.), and the thick hub type, thin hub type, and C cassette type can be distinguished by this eigenvalue A.
[0011]
On the other hand, after the reel hub diameter is determined in this way, the tape speed switching control in the winding mode is performed in the speed mode corresponding to the determined reel hub diameter.
[0012]
Here, the switching of the tape speed in the winding mode is performed while estimating the remaining tape amount of the supply side reel (or the winding side reel). As a method of estimating the remaining tape amount, for example, Using the ratio of the reel pulse period Ts of the supply reel to the reel pulse period Tt of the take-up reel [the following formulas (2) and (3)], the tape speed is switched based on the value N. There is something that is.
[0013]
In the case of FF mode: N = Tt / Ts (2)
In REW mode: N = Ts / Tt (3)
[0014]
That is, the smaller the N value, the greater the remaining amount of tape on the supply side reel, and the greater the N value, the smaller the remaining amount of tape on the supply side reel.
A common reference value is set in the high-speed FF mode and the high-speed REW mode, and when the N value becomes larger than this reference value, the control for decelerating the high-speed tape feed is performed, and the tape end is kept at high speed. I try not to be in position.
[0015]
On the other hand, when C cassette type tape cassettes with different N values for the same tape remaining amount in the FF mode and the REW mode are loaded in the apparatus, the above reference value is obtained even if the N value is calculated during high-speed tape feeding. Since it may not become larger, the tape end position may be reached while running at high speed. Here, the eigenvalue A when a VHS standard C cassette type tape cassette is loaded is 2.2 or less. Therefore, when A ≦ 2.2, it is determined as a C cassette type tape cassette and high-speed tape feeding is executed. It is supposed not to.
[0016]
By the way, in the case of a thin hub type tape cassette of 70 minutes to 90 minutes recently added to the VHS standard, the eigenvalue A is 2.2 or less, and is determined as a C cassette type tape cassette. Therefore, the thin hub type tape cassette of 70 minutes to 90 minutes has a problem that high-speed tape feeding is not performed and FF / REW takes time.
[0017]
Therefore, the applicant of the present application is an FF / REW control device that can execute high-speed tape feeding even when a thin hub type tape cassette of 70 to 90 minutes is loaded and determined as a C cassette type tape cassette. (Utility model registration No. 3076425).
[0018]
This FF / REW control device does not distinguish between thin hub type tape cassettes of 70 to 90 minutes and C cassette type tape cassettes, and high speed FF mode so that high speed tape feeding is possible even with C cassette type tape cassettes. The correspondence between the N value and the tape speed double speed ratio is provided for each of the high speed REW mode and the high speed REW mode, and different control is performed in the high speed FF mode and the high speed REW mode.
[0019]
[Problems to be solved by the invention]
In the above FF / REW controller, even when a thin hub type tape cassette of 70 to 90 minutes is loaded and determined as a C cassette type tape cassette, high-speed tape feeding is performed according to the C cassette type tape cassette. Therefore, the REW time is shortened accordingly.
[0020]
However, high-speed tape feeding performed with a thin hub type tape cassette of 70 minutes to 90 minutes is a high-speed tape feeding control that matches the C cassette type tape cassette, so that the REW time is sufficiently shortened. There was a problem that could not be said. In other words, if a thin hub type tape cassette of 70 minutes to 90 minutes and a C cassette type tape cassette can be discriminated, dedicated high speed tape feed control can be realized for the thin hub type tape cassette of 70 minutes to 90 minutes. Time can be shortened. Therefore, how to distinguish between a thin hub type tape cassette of 70 minutes to 90 minutes and a C cassette type tape cassette remains as a problem.
[0021]
The present invention was devised in view of such problems, and its purpose is to reliably distinguish between a thin hub type tape cassette of 70 minutes to 90 minutes and a C cassette type tape cassette in the high-speed REW mode. An object of the present invention is to provide a tape type discriminating apparatus and a tape type discriminating method for an information recording / reproducing apparatus.
[0022]
[Means for Solving the Problems]
The tape type discriminating apparatus of the information recording / reproducing apparatus of the present invention comprises a reel period measuring means for measuring a rotation period of a supply-side reel and a take-up reel of a loaded tape cassette, and a supply measured by the reel period measuring means. A rotation period ratio calculating means for calculating a ratio N between the rotation period Ts of the side reel and the rotation period Tt of the take-up reel, and the rotation period Ts of the supply side reel measured by the reel period measurement means and the take-up reel A unique value calculating means for calculating a specific value A for each type of tape cassette determined by an arithmetic expression of Ts ** 2 + Tt ** 2 (**: power), Based on the eigenvalue A, there is provided a type discriminating unit for discriminating the type of the tape cassette loaded in the apparatus. In the high-speed rewind mode, the type determining means obtains the value of the rotation cycle ratio N as Ts / Tt, and based on the eigenvalue A when the value of the rotation cycle ratio N is smaller than 1.0. When the tape type discriminated in this manner is a thin hub type, the discriminating result is used as a provisional value, the tape is rewound at a low speed, and when the value of the rotation cycle ratio N becomes approximately 1.0, the eigenvalue A The tape type is discriminated again based on the discriminator, and the tape cassette of the thin hub type or the nonstandard tape cassette is discriminated based on the discrimination result.
[0023]
The tape type discrimination method of the information recording / reproducing apparatus of the present invention is a tape type discrimination method in the high-speed rewind mode, and the rotation period Ts of the supply-side reel of the loaded tape cassette and the rotation of the take-up reel. Based on the period Tt, the rotation period ratio N is obtained by an arithmetic expression of Ts / Tt, and the eigenvalue A determined for each type of tape cassette is obtained by an arithmetic expression of Ts ** 2 + Tt ** 2 (**: power). When the value of the rotation cycle ratio N is smaller than 1.0 and the tape type determined based on the eigenvalue A is a fine hub type, the tape is wound at a low speed using the determination result as a temporary value. When the value of the rotation period ratio N becomes approximately 1.0, the tape type is determined again based on the eigenvalue A, and the thin hub type tape cassette or the nonstandard tape is determined based on the determination result. Characterized in that to determine the set.
[0024]
According to the present invention having such characteristics, in the high-speed rewind mode, when the value of the rotation period ratio N becomes approximately 1.0, the tape type is determined again based on the eigenvalue A, and the determination result is Based on this, it is determined whether the tape cassette is a thin hub type or a thin hub type tape cassette of 70 to 90 minutes. By such a discriminating method, it is possible to discriminate whether the loaded tape cassette is a thin hub type tape cassette of 70 minutes to 90 minutes or a C cassette type tape cassette.
[0025]
That is, when a C-cassette type tape cassette is loaded, as shown in FIG. 2, in the high-speed rewind mode, the N value does not become 1.0 when the tape position is in the middle, and the beginning is higher than the middle. On the side, the N value is 1.0. That is, in the high-speed rewind mode, the N value when the tape position is actually in the middle is about 0.6. This is because a gear whose conversion ratio is not 1 is incorporated in a cassette conversion adapter used when a C cassette type tape cassette is loaded into a video deck, and the reel of the tape cassette rotates through this gear. is there.
[0026]
Therefore, the fixed value A of the C cassette type tape cassette is calculated when the N value is sufficiently smaller than 1.0 (that is, the remaining amount of tape on the supply side reel is small and the remaining amount of tape on the take-up side reel is large). And when the N value is close to 1.0 (that is, when the supply side reel has a large amount of tape remaining and the take-up side reel has a small amount of tape), different values are obtained. .
[0027]
For example, when the N value is sufficiently smaller than 1.0, the fixed value A is a value of A ≦ 2.2, but when the N value is close to 1.0, approximately 1.3 <A ≦ 1. A value in the range of .9. On the other hand, in a thin hub type tape cassette of 70 minutes to 90 minutes, the fixed value A is approximately in the range of 1.9 <A ≦ 2.2 regardless of the N value.
[0028]
That is, when the N value is sufficiently smaller than 1.0, there is a portion where the fixed value A of the C cassette type tape cassette and the thin hub type tape cassette of 70 minutes to 90 minutes overlaps. However, it can be seen that when the N value is close to 1.0, it is possible to distinguish between a C cassette type tape cassette and a thin hub type tape cassette of 70 to 90 minutes.
The tape type discriminating apparatus and the tape type discriminating method according to the present invention have been created by paying attention to the above points.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of a main part (only a part related to the present invention) of a video cassette recorder which is an information recording / reproducing apparatus of the present invention.
[0030]
In the figure, reference numeral 1 denotes a tape cassette loaded in an apparatus main body (not shown), and the supply side reel 2 and the take-up side reel 3 are recorded, reproduced, fast forwarded (FF), and rewound (REW) by the reel driving means 4. Rotational drive control according to various operation modes such as these is performed. The reel driving unit 4 is controlled by a servo controller 5 a connected to the system controller 5.
[0031]
Further, the apparatus main body detects the rotation speed (reel cycle) of the supply-side reel sensor 6 that detects the rotation speed (reel cycle) of the supply-side reel 2 of the loaded tape cassette 1 and the take-up reel 3. Supply side reel sensors 7 are provided, and the output of the supply side reel sensor 6 and the output of the take-up side reel sensor 7 are guided to the system controller 5. Further, the system controller 5 is configured to receive the output of the operation input unit 11 including various function buttons such as a record button, a play button, a fast forward (FF) button, a rewind (REW) button, and a stop button (not shown). It has become.
[0032]
In the present embodiment, the system controller 5 functions as a reel cycle measuring means for measuring the rotation cycles Ts and Tt of the supply-side reel 2 and the take-up reel 3 of the tape cassette 1 loaded, and the measurement. A function as a rotation period ratio calculating means for calculating a ratio N between the rotation period Ts of the supply-side reel 2 and the rotation period Tt of the take-up reel 3, and the measured rotation period Ts of the supply-side reel 2 and the take-up side Function and calculation as eigenvalue calculation means for calculating a specific value A for each type of tape cassette determined by an arithmetic expression of Ts ** 2 + Tt ** 2 (**: power) based on the rotation period Tt of the reel 3. And a function as type discriminating means for discriminating the type of the tape cassette 1 loaded in the apparatus main body based on the rotation period ratio N and the eigenvalue A.
[0033]
Here, the types of tape to be identified are roughly divided into three types: a thick hub type, a thin hub type, and a C cassette type. Although details are omitted, these three types are based on the eigenvalue A in the high-speed FF mode. Can be determined. Therefore, by preparing a speed switching control program corresponding to each type in advance, the optimum high-speed FF mode corresponding to each type can be executed.
[0034]
On the other hand, in the high-speed REW mode, for the thin hub type tape cassette of 70 minutes to 90 minutes and the C cassette type tape cassette, the eigenvalue A may be overlapped depending on the measured N value, and therefore may not be discriminated. .
[0035]
That is, when a C-cassette type tape cassette is loaded, as shown in FIG. 2, in the high-speed REW mode, the N value does not become 1.0 when the tape position is in the middle, and the start side is closer to the middle. N value becomes 1.0. That is, in the high-speed REW mode, the N value when the tape position is actually in the middle is about 0.6.
[0036]
Therefore, the fixed value A of the C cassette type tape cassette is calculated when the N value is sufficiently smaller than 1.0 (that is, the remaining amount of tape on the supply side reel is small and the remaining amount of tape on the take-up side reel is large). And when the N value is close to 1.0 (that is, when the supply side reel has a large amount of tape remaining and the take-up side reel has a small amount of tape), different values are obtained. .
[0037]
Specifically, when the N value is sufficiently smaller than 1.0, the fixed value A is a value of A ≦ 2.2, but when the N value is close to 1.0, approximately 1.3 < The value is in the range of A ≦ 1.9. On the other hand, in a thin hub type tape cassette of 70 minutes to 90 minutes, the fixed value A is approximately in the range of 1.9 <A ≦ 2.2 regardless of the N value.
[0038]
That is, when the N value is sufficiently smaller than 1.0, there is a portion where the fixed value A of the C cassette type tape cassette overlaps with the fixed value A of the thin hub type tape cassette of 70 to 90 minutes. Although the tape type may not be discriminated with the value A, it is possible to discriminate between the C cassette type tape cassette and the thin hub type tape cassette of 70 minutes to 90 minutes when the N value is close to 1.0. I understand.
[0039]
Incidentally, FIG. 3 shows an example of the eigenvalue A of each cassette type calculated when the N value is 1.0 in the high-speed REW mode. That is, the eigenvalue A is A ≦ 1.3 for the C cassette type tape cassette and the thin hub type tape cassette of 60 minutes or less, and the value is in the range of 1.3 <A ≦ 1.9. Is a C cassette type tape cassette and a 60-70 minute thin hub type tape cassette, and the value in the range of 1.9 <A ≦ 2.2 is 70 minutes-90 minutes thin hub type. It is a tape cassette. The eigenvalue A satisfies A> 3.5 for a thick hub type tape cassette. However, the threshold value of the eigenvalue A is an example, and the threshold value of the eigenvalue A naturally changes if the speed ratio at the time of calculation changes.
[0040]
In this embodiment, paying attention to this point, the C cassette type tape cassette and the thin hub type tape cassette of 70 to 90 minutes are discriminated.
[0041]
Next, the discrimination processing operation between the C cassette type tape cassette and the thin hub type tape cassette of 70 to 90 minutes will be described with reference to the flowchart shown in FIG.
[0042]
In the high-speed REW mode, the system controller 5 calculates the N value (= Ts / Tt) by the above equation (3), and determines whether or not the calculated N value is N <1.0 ( Step S1).
[0043]
As a result, when N <1.0 is not satisfied (when it is determined No in step S1), the remaining tape amount of the supply side reel 2 is larger than the remaining tape amount of the take-up side reel 3, so that (1) The characteristic value A of the loaded tape cassette 1 is calculated from the equation (step S2), and the type of tape loaded is determined based on the calculated value (step S3). As described above, the unique value A calculated in this state is unique to each cassette type, and is unique to the C cassette type tape cassette and 70 to 90 minutes of the narrow hub type tape cassette. Therefore, in this case, the tape type of the loaded tape cassette is determined based on the determination result. That is, based on the result determined in step S3, the high-speed REW mode is executed in accordance with a speed switching control program prepared in advance for the tape type in the high-speed REW mode.
[0044]
On the other hand, when the calculated N value is N <1.0 (when it is determined Yes in step S1), the remaining tape amount of the supply-side reel 2 is smaller than the remaining tape amount of the take-up reel 3. Therefore, the characteristic value A of the loaded tape cassette 1 is calculated by the above equation (1) (step S4), and the type of tape loaded is determined based on the calculated value (step S5). As described above, the eigenvalue A calculated in this state has a fixed value because there is a portion where the eigenvalue A of the C cassette type tape cassette overlaps the eigenvalue A of the thin hub type tape cassette of 70 minutes to 90 minutes. In A, it is not possible to correctly distinguish between a C cassette type tape cassette and a thin hub type tape cassette of 70 to 90 minutes. Therefore, if it is determined that the tape cassette is a thin hub type tape cassette of, for example, 70 minutes to 90 minutes as a result of the calculated eigenvalue A (when determined Yes in step S6), the loaded tape cassette is C cassette type. Therefore, the determination result at this time is a temporary result (step S7), and the subsequent processing is performed.
[0045]
On the other hand, when the calculated unique value A is a unique value different from the unique value A of the C cassette type tape cassette or the thin hub type tape cassette of 70 minutes to 90 minutes (when it is determined No in step S6), The operation proceeds to step S3, and the tape type of the loaded tape cassette is determined by the determination result based on the eigenvalue A. That is, based on the result determined in step S3, the high-speed REW mode is executed in accordance with a speed switching control program prepared in advance for the tape type in the high-speed REW mode.
[0046]
On the other hand, when the determination result is a temporary determination result (temporary value) in step S7, the tape is rewound at a somewhat slow speed (step S8).
[0047]
In this rewinding operation, the system controller 5 always calculates the N value (= Ts / Tt) by the above equation (3), and determines whether or not the calculated N value is N <1.0. (Step S9).
[0048]
As a result, when N <1.0 (when it is determined YES in step S9), the rewinding operation is temporarily stopped (step S10), and loaded according to the above equation (1). The unique value A of the tape cassette 1 is calculated again (step S11), and the type of tape loaded is determined based on the calculated value (step S12).
[0049]
That is, in step S12, it is determined whether or not the calculated eigenvalue A is within the range of 1.9 <A ≦ 2.2, and if it is within the range of 1.9 <A ≦ 2.2 (in step S12). If it is determined YES, it is determined that the tape cassette loaded is a thin hub type tape cassette of 70 minutes to 90 minutes (step S13). Thereafter, the high-speed REW mode is executed in accordance with a speed switching control program in the high-speed REW mode that is prepared in advance as a thin hub type tape cassette of 70 to 90 minutes.
[0050]
On the other hand, when it is determined in step S12 that the calculated eigenvalue A is not within the range of 1.9 <A ≦ 2.2 (when it is determined No in step S12), in the next step S14, It is determined whether or not the calculated eigenvalue A is within a range of 1.3 <A ≦ 1.9, and when it is within a range of 1.3 <A ≦ 1.9 (when Yes is determined in step S14) ), It is determined that the tape cassette loaded is a C cassette type tape cassette or a thin hub type tape cassette of 60 minutes to 70 minutes (step S15). After that, the high-speed REW mode is executed according to the speed switching control program in the high-speed REW mode prepared in advance as a C cassette type tape cassette.
[0051]
On the other hand, when it is determined in step S14 that the calculated eigenvalue A is not within the range of 1.3 <A ≦ 1.9 (that is, A ≦ 1.3) (when it is determined No in step S14). Is determined to be a C cassette type tape cassette or a thin hub type tape cassette of 60 minutes or less (step S16). After that, the high-speed REW mode is executed according to the speed switching control program in the high-speed REW mode prepared in advance as a C cassette type tape cassette.
[0052]
【The invention's effect】
According to the tape type discriminating apparatus and the tape type discriminating method of the information recording / reproducing apparatus according to the present invention, when the value of the rotation period ratio N becomes approximately 1.0 in the high-speed rewind mode, the tape is determined based on the eigenvalue A. Since the type is discriminated again and it is configured to discriminate whether it is a thin hub type tape cassette or a non-standard tape cassette based on the discrimination result, the loaded tape cassette is a thin hub type of 70 minutes to 90 minutes. It is possible to accurately determine whether the tape cassette is a C cassette type tape cassette. Therefore, the subsequent high-speed rewind mode can be executed in accordance with an optimum speed switching control program prepared in advance according to the type of tape loaded.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a main part of a video cassette recorder which is an information recording / reproducing apparatus of the present invention.
FIG. 2 is a graph showing a relationship between a tape position and a rotation period ratio of a C cassette type tape cassette.
FIG. 3 is an explanatory diagram showing an example of an eigenvalue A of each cassette type calculated when the N value is 1.0 in the high-speed REW mode.
FIG. 4 is a flowchart for explaining a discrimination processing operation between a C cassette type tape cassette and a thin hub type tape cassette of 70 minutes to 90 minutes.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tape cassette 2 Supply side reel 3 Take-up side reel 4 Reel drive means 5 System controller 5a Servo controller 6 Supply side reel sensor (reel period measurement means)
7 Reel sensor (reel cycle measuring means)
11 Operation input section

Claims (4)

 In an information recording / reproducing apparatus having a high-speed winding mode in addition to a normal winding mode, a reel cycle measuring means for measuring a rotation cycle of a supply-side reel and a winding-side reel of a loaded tape cassette, and this reel cycle measurement A rotation period ratio calculating means for calculating a ratio N between the rotation period Ts of the supply reel measured by the means and the rotation period Tt of the take-up reel, and the rotation period of the supply reel measured by the reel period measurement means A unique value calculating means for calculating a unique value A for each type of tape cassette determined by an arithmetic expression of Ts ** 2 + Tt ** 2 (**: power) based on Ts and the rotation period Tt of the take-up reel; Type discriminating means for discriminating the type of the tape cassette loaded in the apparatus based on the rotation cycle ratio N and the eigenvalue A, and in the high-speed rewind mode, The means obtains the value of the rotation period ratio N as Ts / Tt, and the tape type determined based on the eigenvalue A when the value of the rotation period ratio N is smaller than 1.0 is the thin hub type. In this case, the determination result is a temporary value, the tape is rewound at a low speed, and when the value of the rotation period ratio N becomes approximately 1.0, the tape type is determined again based on the eigenvalue A, and A tape type discriminating apparatus for an information recording / reproducing apparatus, which discriminates between a thin hub type tape cassette and a non-standard tape cassette based on a discrimination result.  A method for discriminating a tape type in a high-speed rewind mode of an information recording / reproducing apparatus having a high-speed take-up mode in addition to a normal take-up mode, wherein a rotation period Ts of a supply-side reel of a loaded tape cassette and a take-up side Based on the reel rotation cycle Tt, the rotation cycle ratio N is calculated by an equation of Ts / Tt, and the eigenvalue A determined for each type of tape cassette is calculated as Ts ** 2 + Tt ** 2 (**: power). When the tape type determined based on the eigenvalue A is a fine hub type when the value of the rotation cycle ratio N is smaller than 1.0, the determination result is used as a provisional value at a low speed. When the tape is rewound and the value of the rotation period ratio N becomes approximately 1.0, the tape type is determined again based on the eigenvalue A, and the narrow hub type tape cassette is determined based on the determination result. Tape type discrimination method of the information recording and reproducing apparatus, characterized in that to determine the tape cassette. A method for discriminating a tape type in a high-speed rewind mode of an information recording / reproducing apparatus having a high-speed take-up mode in addition to a normal take-up mode, and a rotation cycle of a supply-side reel of a loaded tape cassette and a take-up reel The rotation period ratio N is calculated based on the rotation period of the tape cassette, and the eigenvalue A determined for each type of tape cassette is determined. When the value of the rotation period ratio N becomes approximately 1, the calculation is performed at that time. And determining whether the tape cassette loaded is a thin hub type tape cassette or a nonstandard tape cassette based on the eigenvalue A. Assuming that the rotation period of the supply side reel is Ts and the rotation period of the take-up reel is Tt, the rotation period ratio N is a value determined by an arithmetic expression of Ts / Tt, and the eigenvalue A is Ts ** 2 + Tt. 4. The tape type discrimination method for an information recording / reproducing apparatus according to claim 3, wherein the value is determined by an arithmetic expression of ** 2 (**: power).

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