JPS6177185A - Tape remaining quantity detecting and displaying device - Google Patents

Abstract

PURPOSE:To calculate the size of a using hub and a remaining time of a tape capable of recording by detecting the number of rotation of a feed reel and/or a take-up reel different according to a wound quantity of a magnetic tape during loading and unloading of the tape. CONSTITUTION:During loading of a tape, by a photointerrupter 22, the number of slits provided in a disk 20 coaxial with a feed reel, namely the number of pulses n1 is detected, counted by a counter 29a, and a tape wound diameter D1 of the feed reel is calculated in a calculation section 31. In a discriminating section 32, the D1 is compared with a diameter of a large hub, and when the D1 is larger, a fast feed reproduction is carried out until the number of pulses n1 of the feed reel side is counted by the counter 29a. A disk 21 is coaxial with a take-up reel, the number of pulses of the disk 21 is detected by a photointerrupter 26, counted by a counter 29b, and a tape wound diameter D2 of the take-up reel is calculated by the calculation section 31. When the D2 is larger than a diameter of the large hub, a remaining time is detected by the calculation section 31 by using a radius of the large hub and displayed on a displaying device 33.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a tape remaining amount detection and display device that calculates and displays the remaining amount of time on a recordable magnetic tape.

(b) Conventional technology Tape residue I in a magnetic recording/playback device: In the detection and display device, conventionally, as shown in JP-A No. 56-98762, a cassette case is mounted in the mounting position, and a supply reel and a take-up reel are connected. By running the magnetic tape while rotating it in the same direction, the rotational speed of the supply reel and take-up reel is detected, and the remaining time of the magnetic tape is calculated based on this detection output.

(c) Problems to be Solved by the Invention However, in the above-mentioned device, after the cassette housing is attached to the magnetic recording/playback device,
By performing the tape running described above, it is possible to calculate how many minutes the magnetic tape can run, or in other words, it is possible to calculate the remaining amount of time of the magnetic tape wound around the supply reel during tape running. However, with this method, it is not possible to detect the remaining time on the magnetic tape before the tape is running, and even if the recording time of the program you want to record is known, the remaining time is only detected while the magnetic tape is running. There were problems such as the inability to record when the program ended.

B) Means for Solving the Problems The present invention has been made in order to solve the above problems, and provides a magnetic recording and reproducing device that includes a control section for controlling the drive of the magnetic recording and reproducing device, and a cassette casing. The first detects the rotation angle of the supply reel wound with the magnetic tape stored in the
a second rotation angle detection section that detects a rotation angle of a take-up reel around which the magnetic tape is wound;
or a determination unit that determines diameters of a first hub and a second hub constituting each of the supply reel and take-up reel k from the output detected by the second rotation angle detection unit; and an output of the determination unit. a calculation unit that calculates the remaining recordable tape time using the
a display section that displays the calculation output of the calculation section, and is configured to automatically return to the stopped state according to the control output of the control section, and after the tape loading, the first and second hubs are Only when the diameter is not determined by the determining section, the tape is automatically returned to the stopped state through the rewinding or fast forwarding state in the tape loading state, and before the stopped state, the remaining tape time is determined by the calculating section. This is a tape remaining amount detection and display device that calculates the remaining amount of tape.

(E) Function According to the tape remaining amount detection and display device of the present invention, a new mechanism is added at the time of tape a-loading and tape unloading, which are automatically performed after the cassette housing is attached, that is, before tape running. By detecting the rotational speed of the supply reel and/or take-up reel, which varies depending on the amount of magnetic tape wound on the supply reel and take-up reel, the size of the hub being used and the recordable remaining amount of the magnetic tape can be determined. Since it is possible to calculate the amount of time, it has the effect of allowing accurate re-recording time to be confirmed at the time of recording with a simple configuration.

(v) Embodiments The details of the present invention will be explained in detail with reference to the illustrated embodiments.
The figure is a block diagram showing the operation of the tape remaining amount detection device of the present invention, and FIG. 3 is a 70-chart showing the operation of the control section in the tape remaining amount detection and display device of the invention.

To explain the figure numbers and configurations of Figures 1 and 2,
(1) is a cassette housing, (2) is a hub as a first hub that is a component of the supply reel (3), and (4) is a hub as a second hub that is a component of a take-up reel (5). ,+6
1 (71 hakai)” bin, +81 (91 (101 QIu)
i Ka (g, l-' st, (121 (2) is the loading post of the magnetic chi 1α station indicated by the dashed line - j60 - loading post, (to) OG is the magnetic node, α is the capstan, (g) is pinch roller%αuta machine cylinder, (1
) (Foundation) respectively the supply reel (3) and the take-up reel (
5) is coaxially connected to a disc with slits (not shown) provided at predetermined angles, (a) is made up of an LED (2) and a phototransistor (c), and tape loading is performed by commands from the controller. When the supply is activated,
3) A photointerrupter as a first rotation angle detection unit for detecting the rotation angle, (E) is composed of an LED@ and a phototransistor (to), and is operated by the command of the control unit □□□ to detect the rotation angle as described above. A second device that detects the rotation angle of the take-up reel (5).
(29a)
) (29b) are each of the photointerrupters (
A counter that counts the number of pulses detected in (c);
1) is a condition setting unit for setting conditions such as the tape thickness and tape speed of the magnetic tape α4, and a condition setting unit for setting the conditions such as the tape thickness and tape speed of the magnetic tape α4, and a condition setting unit for setting the conditions such as the tape thickness and tape speed of the magnetic tape α4; a calculation unit that calculates the diameter and remaining amount time of the recordable magnetic tape α4 wound on the supply reel (3); a determination unit that determines the size of the diameter of the hub (2) and (4) from the diameter of the side of the hub (3) and the take-up reel (5);
(to) is a display unit that displays the remaining amount of time calculated by the calculation unit c3υ.

First, when the cassette case (1) is attached to a magnetic recording/playback device (not shown), this is detected by the control section (c), and the control output at this time automatically causes the mechanism section (not shown) to
is being driven. From this point, transfer the magnetic tape stored in the cassette case (1) to the loading post (2) (
By moving the loading boss Q2 (13) along the circumferential surface of the cylinder a, the magnetic tape α is wound around the cylinder rod, and the pinch roller is attached to the capstan αη. (to)
Tape loading is completed by pressing the magnetic head QQαQ against the magnetic tape α→.However, unless there is an instruction to enter the recording or reproducing state by then, the tape loading state is followed by a stop state.

Here, the length of the magnetic tape α4 between the guide bins (6) and (7) when the magnetic tape α→ is held between the guide bins (6) and (7) before being pulled out from the cassette housing (1). If L is the length of the magnetic tape α pulled out from the cassette housing (1) after tape loading is completed, then j is given as the length between the guide bins (6) and (7) remains unchanged. Also, L is constant because the position of the mechanism in the tape loading state of the magnetic recording/playback device is constant, so the length of the magnetic tape α station (L-l) drawn from the supply reel (3) is constant. It is.

If the tape winding radius of the supply reel (3) at any given time is R, then the circumference of the supply reel (3) around which the magnetic tape α4 is wound at any given time is 27CR.
When the magnetic tape α4 is pulled out from the cassette housing (1), the supply reel (3) is (L-l)/2πR...
・・・・・・・・・・・・Rotates by ■. In addition, the number of slits provided in the disk mf2n detected by each photointerrack (a) and (e) when the supply reel (3) and take-up IJ reel (5) rotate once, that is, the number of pulses in a predetermined period. Let N be the number of pulses n generated as the supply reel (3) rotates as the magnetic tape (2) is drawn out is n + = (L l ) N / 2πR...
...It is represented by a mark...■.

Here, there are two types of hubs, large and small, and the large and small hubs must be used separately depending on the length and thickness of the magnetic tape α stored in the cassette housing (1). Assuming that the radius of the hubs (2) and (4) is r, the area S of the magnetic tape α wound on the supply reel (3) at any given time is S=π(R2-r”)...・・・・・・
......Represented by ■. Let the tape feed speed of the magnetic tape α chrysanthemum be υ. , if the thickness of the magnetic tape α station is d, the area ΔS of the magnetic tape α wound around the supply reel (3) that runs per unit time is ΔS=υ, d...・・・
・・・・・・Represented by ■.

Therefore, the remaining recordable time T of the magnetic tape 04 wound on the supply reel (3) is T=S/△5=
Represented by yr(R2-r”)/'od ---・■,
Here, if we solve equation 0 for H, R = (L-1)N/2π
nI ・River・・・・・・・・・■ and substituting the 0 formula into the 0 formula, T= (N2(L −1)”/4πυ.d)X(1/n
,”)−πr”/υ. d ・1 river...river...■. ■In the formula, N, (L-1), υ0. All values of d and r are magnetic recording/reproducing device or cassette case (1)
is unique and unchanging, but here hub (2) (
If it is unknown whether 4) is large or small, and if this is to be detected, as mentioned above, the supply reel (3) may be N or the magnetic tape (to).
When loading the tape to draw out the tape, the magnetic tape winding diameter of the supply reel (3) at any given point is 0.
From the formula, D+ = (L l )N/ x nl --song-
■The number of pulses n1 accompanying the rotation of the supply reel (3)
is detected to determine Dl, and by comparing D with the diameter of the large hub, the supply reel (3) and take-up reel (
5) detects the diameter of the hubs (2) and (4) used.

After detecting whether the hub (2) or (4) is large or small, the remaining amount time T can be determined by substituting the radius into the formula for r.

However, if the diameters of the hubs (2) and (4) cannot be detected from the rotation of the supply reel (3), the supply reel ( 3) and the take-up reel (5) by a predetermined amount, and the diameter of the hub (21 (4)) is detected by the rotation of the take-up reel (5) at this time. The number of pulses generated with rotation is 02
Then, the magnetic tape winding diameter of the take-up reel (5) at any point in time is D2=(L-l)N/πn2 as in formula 0.
......■, and the number of pulses n2 is detected,
Decide.

Supply reel (3
) and the hub (2) (4) used by the take-up reel (5)
). And as mentioned above, Busy Hub (2) (
4) After detecting whether it is large or small, its radius is r
The remaining amount time T can be determined by substituting it into the equation.

The remaining tape amount detection and display device of the present invention will be explained below with reference to FIGS. 2 and 3. First, when the cassect housing (1) is attached to the magnetic recording/playback device, the attachment state is detected by the control section (A), and the control output of the control section (A) drives the mechanical section to generate the magnetic field from the supply reel (3) side. Pull out the tape (2) and perform tape loading from this point (steps ■-■). At this time, since the 1-disk holder is coaxially connected to the supply reel (3), it rotates in the same direction and at the same speed as the supply reel (3), and the photo-interrupter holder rotates through the slit provided in the disc (A). The number, ie, the number of pulses n, is detected and counted by a counter (29a).

On the other hand, the condition setting section (1) includes the aforementioned N, L, l, υ0,
d. The radii of the large and small nozzles are input, and the outputs of the condition setting section (7) and the counter (29a) are manually input to the calculation section cIp to determine the magnetism of the supply reel (3) shown in equation 0. The tape winding diameter D1 is calculated (Stellaf theft).

Dl calculated by η of this calculating section is manually input to the discriminating section (2) which stores the diameters of the large and small hubs, and D+ is compared with the diameter of the large hub (step 2).

If the diameter of the large hub is smaller than the diameter of the large hub, it means that the hubs (2) and (4) used for the supply reel (3) and take-up reel (5) are small. The output signal of ■ is input to the condition setting section (to), and the condition setting section (to)
N, L, l, υ stored in. , d and the counter (29a
) is input to the calculation unit Gυ, and the radius of the small hub is input to the calculation unit C11). The remaining amount time T is displayed on the device (steps ■-■). Then, since the remaining amount time T was able to be calculated in the calculation unit G1),
The magnetic tape (2) is wound on the supply reel (3) side according to the control output from the control unit, tape unloading is performed, and the system is brought to a halt state (step 10).

In the above step ①, if Dl is larger than the diameter of the large hub, the supply reel (3) and the take-up IJ-A
Since it is not known whether the hubs (2) and (4) used in /(5) are large or small, the output signal of the discriminator (goods) is input to the control part (c).

Here, the number of rotations of the supply reel (3) during tape loading in step (2), that is, the number of pulses counted by the counter (29a), 01, is stored in the control unit (c), and The mechanism unit is driven by the control signal of the control unit to which the output signal is input, and the magnetic tape α4 is placed on the counter (29a) with the magnetic tape α4 wound around the cylinder.
), the supply reel (3) and the take-up reel (5) are rotated until the number n of pulses on the supply reel (3) is counted, thereby performing, for example, fast-forward reproduction (step 2). At this time, since the disk (goods) is coaxially connected to the take-up reel (5), it rotates in the same direction and at the same speed as the first take-up reel (5), and the disk (goods) is rotated by the photointerrupter ().
The number of slits provided, that is, the number of pulses is detected and counted by a counter (29b). Then, the output of the condition setting section - and the counter (29b) is input to the calculation section c11) to calculate the magnetic tape winding diameter Dt of winding +7- /L/(5) shown in equation 0 (step ). This calculation unit 6η calculates D and inputs it to the discriminating unit (2), where D and the diameter of the hub of the large grave are compared (step (2)).

Here, if D2 is smaller than the diameter of the large hub, the hubs (2) and (4) used for the supply +)-/l/(3) and take-up reel (5) are small. Discrimination part (
The output signal of the first condition setting section 1 is input to the condition setting section -, and the condition value stored in the condition setting section 1 and the number of pulses on the supply reel (3) side counted by the counter (29a) at the time of tape loading, 01, are calculated by the calculation section c1. In addition to inputting the radius of the small knob as r, it is input into the calculation section C11), the remaining amount time T is detected from the formula (■), and the remaining amount time T is displayed on the display section (to) for a predetermined period of time.
is displayed (step ■−■). Then, tape unloading is performed on the supply reel (3) side (step 0).

However, from step ① mentioned above, the magnetic tape (14) is still wound around the cylinder α and the counter (29a
), the supply reel (3) and take-up reel (5) were rotated until the number nl of pulses of the supply reel (3) was counted, and fast-forward playback was performed. The supply reel (3) and take-up reel (5) are rotated until the number of pulses 11 on the supply reel (3) is counted in step 29a), that is, to the tape position before the tape loading in step (2) described above. The magnetic tape α4 is rewound to the (3) side, and the magnetic tape α4 is now in a stopped state (step @-[phase]-■).

If D2 is larger than the diameter of the large hub in step ① above, the supply reel (3) and take-up reel (5)
The hubs (2) and (4) used in
In addition to inputting the condition value stored in the condition setting section (1) and the number of pulses n1 counted by the counter (29a) during tape loading into the calculation section 61), the radius of the large hub is calculated as Enter the remaining time T from the formula (Step ■), and follow the steps ■-o-■-
[Stocks] - Execute 〇. Note that the fast-forward playback in step ■ mentioned above may also be rewind playback, in which case step ■
Rewinding is fast forwarding.

Here, when the remaining amount time T is specifically calculated, it is as follows. For example, the length between tape guide pins (6) and (7):
A! =75C:), length of magnetic tape α chrysanthemum pulled out from cassette housing (1): L =290 CmmJ
.

Radius of hub + 2) (4) determined by the determination unit (to):
r=8 [dish], number of pulses generated when the supply reel (3) rotates once: N=100. Tape feed speed of magnetic tape α: υ. = 15 [tomo/5ec), thickness of magnetic tape α4: d = 15 x 10'''' 3 [balls], and when the supply reel (3) rotates, for example, twice during tape loading,
nh” 200, so by substituting the above value into formula (■).

T=3193 (sec):=53 (m) 13 (
sec), and the remaining time T of the magnetic Q1α station wound on the supply reel (3) is determined.

Furthermore, when the stopped state is a loading state in which the magnetic tape α→ is pulled out by a predetermined length from the cassette case (1), the length of the magnetic tape α existing outside the cassette case (1) is Ll. Then, since the position of the mechanical part of the magnetic recording/playback device is constant, this value is constant, and the number of revolutions n1 of the supply reel (3) at this time, and L+
, 13. From each value of 'o-d, r and N, the hub (2) (4) goes from tape loading state to tape unloading state to no-loading state.
It is also possible to calculate the remaining amount time T by detecting the magnitude of the amount.

In this embodiment, a supply reel (3) and a take-up reel (
During the rotation of the supply reel (3) and the take-up reel (5), slits provided at predetermined angles in one disc (A)
), and as a means to detect the rotational speed of the supply reel (3) and take-up reel (5).
3) and a disk (2) provided coaxially with the rotating shaft of the take-up reel (5) may be magnetized.

Furthermore, there is no problem in operating the photointerrupter@Kan in a mode other than tape loading and tape unloading and displaying the remaining time T on the display section.

(G) Effects of the Invention According to the tape remaining amount detection and display device of the present invention, a new mechanism is added during tape loading and tape unloading that are automatically performed after the cassette case is attached, that is, before tape running. By detecting the rotation speed of the supply reel and/or take-up reel, which varies depending on the amount of magnetic tape wound on the supply reel and take-up reel, it is possible to determine the size of the knob being used and the recordability of the magnetic tape. Since the remaining time can be calculated, it is possible to check the accurate recordable time when recording with a simple configuration, and when the record button is pressed at the same time as the pause button.

Advantages such as being able to stand by for recording while the tape is loaded and checking the available recording time are obtained.

FIG. 1 is a plan view showing a tape loading state of a magnetic recording and reproducing apparatus using the tape remaining amount detection and display device of the present invention, and FIG. 2 is a block diagram showing the operation of the tape remaining amount detection and display device of the present invention. FIG. 3 is a flowchart showing the operation of the control section in the tape remaining amount detection and display device of the present invention.

Explanation of main drawing numbers (1)...Skein 7) Housing, (2) (41...Hub, (3)...Supply reel, (5)...Take-up reel, 04). ··Magnetic tape.

翰(4)...Photointerrack, (A)...Control unit, OD...Calculation unit, (2)...Discrimination unit, 03
...Display section.

Claims (1)

[Claims] (1) In a magnetic recording/playback device, a control unit that controls the drive of the magnetic recording/playback device, and a first rotation angle detection unit that detects the rotation angle of a supply reel wound with a magnetic tape housed in a cassette housing. a second rotation angle detection section that detects the rotation angle of the take-up reel around which the magnetic tape is wound; and a second rotation angle detection section that detects the rotation angle of the take-up reel around which the magnetic tape is wound; and a determining unit that determines the diameter of a first hub and a second hub constituting each of the take-up reels, a calculating unit that calculates the remaining recordable tape time using the output of the determining unit, and the calculating unit. The control output of the control section causes the magnetic recording/playback device to automatically switch from a stopped state immediately after the cassette case is attached to a tape loading state in which one of the reels is rotated. and only when the diameters of the first and second hubs are not determined by the determining section after the tape loading, the tape rewinding and/or fast forwarding state is performed in the tape loading state. A remaining tape amount detection and display device, characterized in that the remaining tape amount detection and display device is configured to automatically return to the stopped state, and calculates the remaining tape amount time by the calculation unit before the stopped state.