JPS6147445B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tuner that performs tuning using, for example, a variable inductance element, and more particularly to a tuner that uses a memory board to preset the tuning frequency. It is related to.

Tuning frequency (tuned frequency) using memory board
A push-button tuner for presetting is well known, as shown in, for example, Japanese Utility Model Publication No. 48-45362. However, this type of tuner is provided with a pair of parallel engaging rods that can obtain an angle corresponding to the amount of movement of the magnetic core of the variable inductance element, and the relationship between the rotational position of the pair of engaging rods and the memory board is Since the structure is such that the tuning frequency is preset, it has been impossible to form it thinly.

On the other hand, Japanese Unexamined Patent Publication No. 159801/1989 discloses a push-button tuner which is made thinner by forming a memory plate and related parts into a plate shape. However, this publication does not disclose a thin push button tuner that can be tuned with high precision and is easy to manufacture.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a preset tuner that can be tuned with high precision and is easy to manufacture.

To achieve the above object, the present invention will be described with reference to the reference numerals in the drawings showing embodiments. The present invention includes a tuning circuit 5 including a variable impedance element 1, and a first A sliding plate 14 that is arranged to move in the direction of First and second rotating plate engaging portions that are pivotally supported and selectively engage first and second memory plate engaging portions 22 and 26 of first and second rotating plates 19 and 20, which will be described later. Memory board 31 provided with joints 32 and 33
The sliding plate 1 is pivoted on a fixed part and rotates by an angle corresponding to the amount of movement of the sliding plate 14.
4, and a first memory plate engaging part 22 that engages with the first rotating plate engaging part 32 of the memory board 31. The first rotary plate 19 is pivotably supported by a fixed portion and is engaged with the pin 28 of the sliding plate 14 so as to rotate by an angle corresponding to the amount of movement of the sliding plate 14. It has a U-shaped engaging part 25 that engages with the second rotating plate engaging part 33 of the memory board 31, and has a second memory plate engaging part 26 that engages with the second rotating plate engaging part 33 of the memory board 31.
The second memory plate engaging portion 26 is arranged so as to rotate in the opposite direction to the first rotating plate 19 when pressed by the second rotating plate engaging portion 33 of the first memory plate 19. a second rotary plate 20 extending in a second direction perpendicular to the first direction and supported by a base so as to be movable in the second direction; , a return spring 44 that applies a biasing force to the memory support plate 35 in the direction of separating the memory plate 31 from the first and second rotation plates 19 and 20, and a rotation of the memory plate 31. a lock portion 62 for selectively blocking the rotation of the memory board 31, and a lock portion 62 that engages with the lock portion 62 to selectively obtain a state in which the rotation of the memory board 31 is inhibited by the lock portion 62 and a state in which the rotation inhibition is released. When storing the state of the variable impedance element 1 in the memory board 31, the memory board 31 is provided with a lock control member 55 for controlling the memory board 31 in a state in which the memory board 31 is unlocked by the lock unit 62. by moving the memory board 31 in the direction of the first and second rotating plates 19 and 20, the first and second rotating plates 14 are The rotation angle of the memory plate 31 is locked by operating the lock control member 55, and the rotation angle of the memory plate 31 is locked by operating the lock control member 55. When obtaining the state of the variable impedance element 1 corresponding to the stored content, the first and second rotating plates 19, 20 are moved by moving the memory support plate 35 against the return spring 44.
is a rotation angle corresponding to the rotation angle of the memory plate 31, and the sliding plate 14 slides by an amount corresponding to the rotation angle of the first and second rotation plates 19, 20. This relates to a constructed preset type tuner.

In the above invention, the first and second U-shaped engaging portions 21 and 25 of the first and second rotating plates 19 and 20 are respectively engaged with the pin 28 provided on the sliding plate 14, The first and second memory plate engaging portions 22, so that the first and second rotating plates 19, 20 rotate in opposite directions when pressed by the memory plate 31,
26 are arranged. Therefore, although the engagement structure between the first and second rotary plates 19, 20 and the sliding plate 14 is simple, an engaged state with little backlash can be achieved, and accurate synchronization can be achieved.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 13.

FIG. 1 is a plan view schematically showing the overall structure of a tuner according to an embodiment of the present invention, and FIG. 2 is a front view thereof. As is clear from FIG. 2, this tuner is formed extremely thin. In FIGS. 1 and 2, 1 is a variable inductance element, which is composed of a fixed coil portion 2 and a movable magnetic core 3. In FIG. Reference numeral 4 denotes an electric circuit portion to which the variable inductance element 1 is connected, and this electric circuit portion 4 and the variable inductance element 1 form a tuned circuit 5. Reference numeral 6 denotes a manual tuning shaft, which is engaged with a slider 10 via a gear 7, a fan-shaped gear 8 meshing with this gear 7, and a crank 9 connected to this gear 8. Although not shown, a gear is provided for converting the rotation of the manual tuning shaft 6 into the rotation of a gear 7 in a direction orthogonal thereto. Further, a clutch portion 11 is provided for disconnecting the manual tuning mechanism when selecting a channel using the push button, and is configured to separate the small gear 7 from the fan-shaped gear 8 when selecting a channel using the push button. In this embodiment, the clutch actuating mechanism operates the clutch portion 11 in a known manner in conjunction with the operation of the push button.
However, the gear 7 and the sector gear 8 may be disengaged by pulling or pushing the manual tuning shaft 6.

The crank 9 is rotatable around a shaft 12,
The U-shaped notch at one end engages the pin 13 of the slider 10, and the U-shaped notch at the other end engages the pin 15 of the sliding plate 14. The slider 10 has a guide rod 16 extending in the same direction as the magnetic core 3,
17, so it moves linearly following the rotation of the crank 9.

Since the magnetic core 3 is fixed to the slider 10, when the manual tuning shaft 6 is rotated, this rotational motion is converted into linear motion of the slider 10 and the magnetic core 3 via the gear 7, sector gear 8, and crank 9, and the magnetic core 3 is displaced in its axial direction, the inductance value of the inductance element 1 changes, and a desired tuning state is obtained. Further, the displacement of the slider 10 to which the magnetic core 3 is fixed is controlled by the sliding plate 1 via the crank 9.
4, the sliding plate 14 moves in the left-right direction (first direction) guided by the pin 63 inserted into the elongated hole 64, and conversely, when the sliding plate 14 is displaced in the left-right direction, this The crank 9 rotates in accordance with this rotation, and the slider 10 is further displaced in accordance with this rotation.

This tuner is configured to tune to a desired station, ie, frequency, using a manual tuning shaft 6, store this tuning state in a memory board, and select a station by simply operating a push button 18 thereafter. Therefore, as will be clear from the description below, the push button 18 drives the sliding plate 14 via the memory board, and the value of the variable inductance element 1 changes according to the displacement of the sliding plate 14.
The station stored on the memory board is selected.

3 and 4 show the mechanism between the sliding plate 14 and the push button 18. In this drawing,
19 is a first rotating plate, and 20 is a second rotating plate. As shown in FIG.
2, and is rotatable around a pivot 24 inserted into the hole 23. The second rotating plate 20 is formed symmetrically with the first rotating plate 19 as shown in FIG. 7, and has a U-shaped engagement portion 25 and a second memory plate engagement portion 26. It is rotatable about a pivot shaft 24 inserted into a hole 27.

A pin 28 is implanted in the sliding plate 14, and the pin 28 is inserted into the U-shaped engaging portions 21 and 25 of the first and second rotating plates 19 and 20, respectively, and the pivot 24 is connected to the fixed base plate 30. Therefore, when the sliding plate 14 moves in the first direction (vertical direction) shown by the arrow 29, the rotating plates 19 and 20 follow this and rotate clockwise or counterclockwise. do.

31 is a fan-shaped memory board;
As shown in the figure, it has first and second rotating plate engaging parts 32 and 33 that are spaced apart from each other by about 180 degrees, and a pin 36 serving as a pivot is inserted into a hole 34 in the center thereof. ing. Note that the first and second rotating plate engaging portions 32 and 33 are connected to the first and second rotating plates 19 and 20.
In order to reliably engage the memory plate engaging parts 22 and 26 of the memory board, it is formed with a bent part.

The memory support plate 35 is formed as shown in FIG. 9 and is arranged perpendicular to the sliding plate 14. A guide pin 38 is inserted into the elongated hole 37 formed here.
is inserted, and guided by it, arrow 3 is shown in Figure 3.
It is slidable in the second direction (left and right direction) indicated by 9. Note that the guide pin 38 is implanted in the substrate 30. Further, the memory support plate 35 has a spring receiving step portion 40.
A portion 41 protrudes from the case through a hole 42 formed in the case, that is, the substrate 30, and a return spring 44 is installed between the back surface portion 43 and the stepped portion 40 of the substrate 30. Therefore, the memory support plate 35 is always supported by the spring 44 in FIGS. 3 and 4.
In the figure, it is receiving a biasing force in the right direction.

In addition to the memory board 31, the memory support plate 35 includes:
A lock portion 62 for selectively preventing rotation of the memory board 31 is attached. This lock part 62
are the locking leaf spring 45 and this locking leaf spring 4.
A leaf spring lever 46 for selectively actuating 5.
It consists of In FIG. 4, the locking leaf spring 45 for applying a counterclockwise force to the lever 46 is the 10th
As shown in the figure, the memory support plate 35 has a hole 47 through which the pin 36 of the memory support plate 35 is inserted.
The cut-out portion 48 of the leaf spring lever 4 is inserted through the cut-out portion 48 of
It has a notch 49 into which the tip of the memory board 31 is inserted, and a pressing surface 50 that presses the memory board 31. The right end 51 of this locking leaf spring 45 is bent downward in FIGS. 4 and 5. The leaf spring lever 46 is a thick leaf spring that is relatively difficult to deform.
It is formed as shown in FIG. 1, and has a hole 52 for inserting the cut-and-raised portion 48, and has an elongated lock control member engaging portion 53 on the right side thereof.

The attachment of the locking leaf spring 45 and lever 46 to the memory support plate 35 is clear from FIGS. 3 and 4, which show the locked state of the memory board 31, and FIG. 5, which shows an enlarged view of the unlocked state of the memory board 31. Place the locking leaf spring 4 on top of the memory board 31 as shown in the figure.
5 is arranged, and the lever 4 is placed on top of this plate spring 45.
6 is placed. In the unlocked state shown in FIG.
is not pushed strongly in the direction of memory 31. Therefore, the memory board 31 is rotatable around the pin 36. On the other hand, in the locked state shown in FIG. 4, the lever 46 is urged to rotate clockwise about the raised portion 48, and its left end 54 strongly presses the locking leaf spring 45. The memory plate 31 is also strongly pressed through a leaf spring 45 and is locked substantially unrotatable. That is, the memory board 31 is in a state where a certain angle is stored.

Reference numeral 55 designates a plate-shaped lock control member, and as shown in FIG.
and a protrusion 57 for operating the lever 45.
and a stopper 58 provided on the memory support plate 35.
The push button 18 is attached to the right end of the stepped portion 59. When attached to the memory support plate 35, in the unlocked state shown in FIG. 5, the protruding part 57 does not press the tip engaging part 53 of the lever 46 downward in FIG. 5, and in the locked state shown in FIG. 57 is configured to press downwardly the tip engaging portion 53 of the lever 46.

Next, the handling method and operation of the tuner constructed as described above will be described.

First, when storing a broadcast station or frequency in the memory board 31, the lock control member 55 is pulled out to the position shown in FIG. 5 by pulling out the push button 18.
As a result, the locking or pressing of the memory board 31 by the lever 46 and the leaf spring 45 is released, and the memory board 31 becomes freely rotatable. However, the rotating plate engaging portion 3
2 and 33 are provided in the falling state in FIG. 5, their rotation is restricted by the leaf spring 45. Therefore, the engaging parts 32 and 33 face in opposite directions, and the rotating plate 1
No situation arises in which rotation of parts 9 and 20 becomes impossible.
On the other hand, the magnetic core 3 is moved by the rotation of the manual tuning shaft 6, and a predetermined tuning state, that is, tuning is achieved. The sliding plate 14 also moves in response to the movement of the magnetic core 3, and the position of the sliding plate 14 corresponding to the position of the magnetic core 3 is obtained. Since the first and second rotating plates 19 and 20 are engaged with the sliding plate 14 through pins 28,
A rotation angle of the rotation plates 19 and 20 corresponding to the position of the sliding plate 14 is obtained.

In the setting state as described above, push button 18 and lock control member 55 are pushed to the left in FIGS. 3 and 4. At this time, when the left end of the lock control member 55 is moved under the leaf spring 45 and the lever 46, the frictional resistance given by the spring action etc. is set to be larger than the force of the return spring 44, so that the lock control member 55 limits the rotation of the memory plate 31, the memory support plate 35 moves to the left against the return spring 44, and the rotation plate engaging portions 32, 33 of the memory plate 31 engage the rotation plates 19, 33. The memory plate 31 is engaged with the memory plate engaging portions 22 and 26 of 20 as shown in FIG. If the push button 18 is pressed further, the lock control member 55 moves, and the protrusion 57, which is formed so as to be gradually higher from left to right, enters above the tip of the lever 46, and the lever 46 is moved. It is rotated clockwise in FIGS. 4 and 5, and the left end 54 of the lever 46 presses the memory board 31 via the leaf spring 45 to lock it in that position. Further, the lock control member 55 is pressed toward the memory support plate 35 by the leaf spring 45 and the leaf spring lever 46 and is elastically held in that position. The memory plate 31 is connected to the rotating plates 19 and 20.
When the push button 18 is released from the push button 18 after being engaged with the memory support plate 3, the return spring 44
5 returns to the position shown in FIGS. 3 and 4, and the memory board 3
The storage for 1 is completed.

Note that when the rotating plates 19, 20 and the memory plate 31 are engaged, the first rotating plate 19 rotates in the clockwise direction indicated by the arrow 60 in FIG. Since it rotates in the counterclockwise direction shown by the arrow 61, the pin 28
is sandwiched between the U-shaped engaging portion 21 of the first rotating plate 19 and the U-shaped engaging portion 25 of the second rotating plate 20, and accurate engagement with no gap is achieved. holds true.

Since the push button type preset sections shown in FIGS. 3 and 4 are provided in the same number as the push buttons 18, it is possible to set a plurality of tuning frequencies in advance.

As shown in FIGS. 3 and 4, when selecting a channel by operating the push button 18 after storing the tuned frequency in the memory board 31, the memory support plate 55 is used together with the push button 18.
is pushed in to engage the memory plate 31 with the first and second rotating plates 19 and 20. Since it had been receiving a different frequency until now, the rotating plates 19 and 20 were not connected to the sliding plate 1.
4, the memory plate 31 engages with the rotating plates 19, 20, so that the rotating plates 19, 19, 20 move to the rotating angle corresponding to the memory plate 31. 20 rotates, the sliding plate 14 moves following the rotation of the rotating plates 19 and 20, the crank 9 rotates following the sliding plate 14, and the magnetic core 3 further moves. The desired state of tuning is obtained.

At this time, a clutch drive mechanism (not shown) operates in conjunction with the operation of the push button 18, and the clutch portion 11 operates to separate the gear 7 from the fan-shaped gear 8, regardless of the gear mechanism of the manual synchronization shaft 6. Channel selection is made using push button 18. After selecting the station, press button 18.
When the push button 18 is released, the return spring 44
The clutch portion 11 is then returned to its non-operating state. Therefore, the manual tuning shaft 6 and the slider 10 are coupled by a gear, and the slider 10 does not easily move due to vibrations or the like.

The preset tuner of the present invention described above has the following advantages.

(a) The memory board 31 is arranged horizontally, and the rotating board 1 is attached to it.
9 and 20 are engaged to transmit the lock position of the memory plate 31 to the sliding plate 14, or conversely, to transmit the position of the sliding plate 14 to the memory plate 31, thereby providing an extremely thin tuner. You can. That is, the thickness of the push button operation part of the conventional tuner was about 23 mm, but in this example it is about 7 mm.
This makes it possible to significantly reduce the thickness. Therefore, it becomes possible to incorporate a cassette type tape recorder into the conventional tuner part of a car radio.

(b) Using the first and second rotating plates 19, 20,
Since the movable parts rotate in opposite directions when engaged with the memory plate 31, it is possible to transmit the position without any play in the movable parts, and it is possible to obtain accurate synchronization.

(c) Since the position of the memory board 31 is transmitted to the sliding plate 14 via the rotating plates 19 and 20, there is relatively little loss of force, and a synchronized state can be obtained with a relatively light push button operation.

Although the embodiments of the present invention have been described above, the present invention is not limited thereto and can be further modified. For example, the left end of the leaf spring 45 of the lock portion 62 for selectively locking the memory board 31 may be further extended, and the memory support plate 31 may be locked as needed.
It is also possible to have a configuration in which it is locked to 5. Furthermore, the lock portion 62 that selectively presses the memory board 31 may be formed with a single leaf spring without using both the leaf spring 45 and the leaf spring lever 46. It is also applicable to the case where a variable resistor or a variable capacitor is used in place of the variable inductance element 1. It is also applicable to a case where the magnetic core 3 is directly coupled to the sliding plate 14 so that the sliding plate 14 and the magnetic core 3 move in the same direction.

[Brief explanation of the drawing]

The drawings show a preset type tuner according to an embodiment of the present invention, in which FIG. 1 is a plan view showing a part of the tuner, FIG. 2 is a front view of the tuner, and FIG. 3 is a view taken along the - line in FIG. FIG. 4 is a sectional view showing a part of the part corresponding to the - line in FIG. 3, and FIG. 5 is a part corresponding to FIG. 4 showing the unlocked state. Cross-sectional view, No. 6
7 is a plan view of the second rotating plate, FIG. 8 is a plan view of the memory board, FIG. 9 is a plan view of the memory support plate, and FIG. 10 is a plan view of the first rotating plate. 11 is a plan view of the leaf spring lever, FIG. 12 is a plan view of the lock control plate, and FIG. 13 is a plan view showing the engagement relationship between the memory plate and the rotating plate. be. In the symbols used in the drawings, 1 is a variable inductance element, 14 is a sliding plate, 19 is a first rotating plate, 20 is a second rotating plate, 31 is a memory plate, and 44 is a return plate. Spring, 45 is a lock plate spring, 4
6 is a leaf spring lever, and 55 is a lock control member.

Claims (1)

[Claims] 1 Tuning circuit 5 including variable impedance element 1
and a pin 28 which is arranged to move in a first direction in conjunction with the movable part of the variable impedance element 1 and is engaged with first and second rotating plates 19 and 20, which will be described later. A sliding plate 14 that has a sliding plate 14, which is pivotally supported by a memory support plate 35 described below, and is connected to first and second memory plate engaging portions 22 and 26 of first and second rotating plates 19 and 20 described later. a memory board 31 provided with first and second rotary plate engaging parts 32 and 33 that selectively engage; The sliding plate 14 rotates.
It has a U-shaped engaging part 21 that engages with the pin 28 of the memory board 31, and a first memory plate engaging part 22 that engages with the first rotating plate engaging part 32 of the memory board 31. a first rotating plate 19 that is pivoted on a fixed part and rotates by an angle corresponding to the amount of movement of the sliding plate 14;
It has a U-shaped engaging part 25 that engages with the pin 28 of the memory board 31, and a second memory plate engaging part 26 that engages with the second rotating plate engaging part 33 of the memory board 31. The second memory plate engaging portion is configured to rotate in the opposite direction to the first rotating plate 19 when pressed by the second rotating plate engaging portion 33 of the memory board 31. 26, and a second rotating plate 20, which is arranged to extend in a second direction perpendicular to the first direction and supported by the base so as to be movable in the second direction. a return spring 44 that applies a biasing force to the memory support plate 35 in the direction of separating the memory plate 31 from the first and second rotating plates 19 and 20; a lock portion 62 that selectively blocks rotation of the plate 31; and a lock portion 62 that engages with the lock portion 62 to lock the plate 31.
a lock control member 55 for selectively obtaining a state in which rotation of the memory board 31 is inhibited and a state in which the rotation inhibition is released; When storing the state, the memory board 31 is moved to the first and second states with the lock section 62 unlocking the memory board 31.
the first and second rotating plates 19, by which the memory plate 31 is determined corresponding to the sliding position of the sliding plate 14 by moving in the direction of the rotating plates 19, 20; The memory board 31 is rotated to a rotation angle corresponding to the rotation angle of the memory plate 31, and the rotation angle of the memory plate 31 is locked by operation of the lock control member 55, and the variable rotation angle corresponding to the memory contents of the memory plate 31 is locked. When obtaining the state of the impedance element 1, by moving the memory support plate 35 against the return spring 44, the first and second rotating plates 19,
20 is a rotation angle corresponding to the rotation angle of the memory plate 31, and the sliding plate 14 is
A preset type tuner configured to slide by an amount corresponding to the rotation angle of rotation plates 19 and 20.