JPS6196543A - Cassette type tape recorder - Google Patents

Abstract

PURPOSE:To switch automatically a tape kind discriminating switch by constituting a titled tape recorder so that a detecting arm fits a detecting part into its recessed part and turns, in case when a specified cassette having the recessed part on the back of a cassette housing has been loaded. CONSTITUTION:In case when a loaded tape cassette is a specified tape cassette which has contained a specified tape, since a recessed part is formed on the back of its housing, a detecting arm 53 turns counterclockwise in the figure through an elastic piece 61 by turning a turning member 59, and a tip part 58A of a detecting tongue piece 58 is fitted to its recessed part. Subsequently, by turning the arm 53, a working piece 62 brings a tape kind discriminating switch 63 to on-operation. By the on-operation of the switch, a control mechanism 64 is operated. On the contrary, in case when the loaded tape cassette is other than the specified tape cassette, since no recessed part is formed on the back of its housing, the switch 63 is energized and executes no on-operation.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention automatically distinguishes between tape cassettes containing metal tapes, chrome tapes, etc. (hereinafter referred to as specific tape cassettes) and other tape cassettes. The present invention relates to a cassette-type tape recorder in which operations such as playback and recording are performed in accordance with the loaded tape cassette.

[Problems to be solved by conventional technology and invention]

Generally, magnetic tape uses iron oxide or the like based on the difference in magnetic recording/reproduction methods, and there are specific tapes such as 1, 1, 1, and chrome thread tapes or metal tapes. When recording and reproducing, it is necessary to provide an electric circuit that matches the characteristics of the tape being used, and in order to be able to use different types of tapes, it is necessary to switch the electric circuit. Recesses are formed at predetermined positions on the back surface of the cassette housing for Naorihimu tape, metal tape, etc., and the type of tape can be determined by the presence or position of the recess.

However, with conventional tape recorders, the user had to distinguish the type of tape each time and manually change the switch to suit the tape being used, which forced the user to perform complicated operations and also caused errors in judgment. Alternatively, there was a possibility that an erroneous operation would occur.

The present invention has been made based on the above points, and its purpose is to automatically determine the type of tape and change the switch according to the type of tape, thereby avoiding the occurrence of erroneous operations and misjudgments as in the past. An object of the present invention is to provide a cassette-type tape recorder that can prevent such problems.

[Means for solving problems]

That is, the cassette-type tape recorder according to the present invention includes a main board on which a tape drive mechanism including a reel shaft and a capstan shaft into which a tape cassette is loaded is mounted, and a tape drive mechanism mounted on the main board that is capable of reciprocating in the axial direction of the reel shaft. a cassette holder that holds an attached tape cassette and moves forward to load the tape cassette onto a reel shaft and a capstan shaft, and moves back to detach the tape cassette from the reel shaft and capstan shaft; and a magnetic head. The magnetic head is mounted on the main board so as to be able to move back and forth in a direction toward and away from the tape in the tape cassette, and is prohibited from forward movement when the cassette holder is at the tape cassette detachment position. a head mounting plate; a side wall having a part having an opening and standing close to one side of the cassette holder at a position opposite to the magnetic head with respect to the reel axis of the Ail main board; an inoect mechanism attached to the surface of the side wall opposite to the cassette holder for moving the cassette holder back from the tape cassette loading position to the tape cassette removal position; (with a detection part and always through the opening in the side wall)
It has been retracted to a position away from the cassette holder's orbit.
By moving the magnetic head of the head mounting plate in the direction of bringing it into contact with the tape in the tape cassette, rotation biasing force is applied via the elastic member, and a specific tape cassette having a recess at a predetermined position on the back surface of the cassette housing is loaded. The tape type detection switch is equipped with a detection arm that rotates by fitting the detection section into the recess when the detection arm is rotated, and a tape type discrimination switch that is biased by the detection arm and operates to switch when the detection arm rotates. be.

[Effect]

In other words, if the tape cassette loaded via the cassette holder is a specific tape cassette that has a recess on the back of the cassette housing, the detection arm rotates with the detection part housed in the recess, and other tape cassettes When loaded, rotation of the detection arm is prohibited. Depending on whether the detection arm rotates or not,
The tape type discrimination switch is selectively switched, and operations such as reproduction and recording are performed according to the type of the loaded tape cassette.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6. FIG. 1 shows a plan view. On the upper surface side of the main board 1, there are a pair of reel shafts 2h, 2b, a capstan shaft 3h, 3b, and a motor 4t-- which rotationally drives these.
Equipped with chive drive mechanism including. The motor 4 simultaneously rotates both capstan shafts 3m and 3b in the respective tape feeding directions 9, and also rotates a pair of tape roll shafts Ja,
3b is alternatively rotated in each tape winding direction.

In addition, a magnetic head 5 for recording and playback is provided on the top surface of the main board 1.
A corresponding pinch roller 6*, 6b is attached to each capstan shaft 3*, 3b.

Further, a cassette holder 7 is attached to the upper surface of the main board 1. The cassette holder 7 includes a rotary plate 8 that can freely rotate vertically (perpendicular to the plane of the paper) about the left edge in FIG. The cassette inserter 9 is rotatably supported (in a direction perpendicular to the cassette inserter 9). Note that the amount of upward rotation of the rotating plate 8 is regulated by a stopper 10 formed at the upper part of the side wall 52 of the main board 1, and this stopper IQ
Due to the presence of the rotating plate 8 and the cassette insert 9, the rotating plate 8 and the cassette insert 9 are held substantially parallel to the main board 1 when they are moved upward.

The cassette inserter 9 has a cassette insertion/ejection port 11 on the right end side in FIG. 1, through which the tape cassette 12 can be inserted/removed. By rotating the rotary plate 8 downward in this state, the tape cassette 12 is loaded onto the reel shafts 2a, 2b and the capstan shafts 3m, 3b. Here, the rotating plate 8 rotates downward to move the tape cassette 12 to the reel shafts 2&, 2.
The position where the cassette holder 7 is loaded into the cassette holder 7 and the capstan shaft Ja and 3b is referred to as the 6-pair operation position of the cassette holder 7, and the rotating plate 8
The cassette holder 7 is rotated upward so that the tape cassette 12 can be inserted and removed from the cassette insertion/ejection opening 11.
This will be referred to as the "stop position".

When the cassette holder 7 moves from the stop position to the operating position, the magnetic head 5 moves downward in FIG. becomes. Also, when the magnetic head 5 is inserted into the tape cassette 12 in this way, the pinch roller on the same side as the reel axis on the side driven by the motor 4 is moved to the capstan axis on the same side. It comes into pressure contact with the For example, reel axis 2 on the right
When the roller a is being driven, the right pinch roller 6a comes into contact with the right capstan shaft 3a. In this way, the magnetic tape is driven rightward (or leftward), and a recording or reproducing operation is performed. .

In addition, reference numerals 13 and 14 in FIG. 1 indicate operating members for fast-forwarding the tape. These operating members 13 and 14 are arranged above the magnetic head 5 so as to overlap each other, and are movable back and forth in the left and right directions in the figure. In addition, each tension spring 1
3a.

14th, it is always urged to the right. By moving one operating member 13 to the left, the rotational force of the motor 4 is transmitted to the right reel shaft 2a as controlled rotation, and by moving the other operating member 14 to the left, the motor 4 is transmitted to the left reel shaft 2b as high-speed rotation.

A spring bearing member 15 is provided on the upper surface of the rotating plate 8, and one end is connected to the shaft 1.
5a and is rotatably mounted.

Further, an eject member 16 is attached to the rotary plate 8 and is slidable in the insertion/removal direction of the tape cassette 12 (left-right direction in FIG. 1).

The spring receiving member 15 has its rotating end connected to the ejecting member 1.
The rotation (rjIh'k) is regulated by an arcuate hole 17 arranged toward the 6 side and provided in the rotation plate 8. And, between the eject member 16 and one end of the spring receiving member 15, an iso-eject spring 18 made of a deployment spring is stretched.

The ejecting member 16 has one end (the left end in FIG. 1).
, the tape cassette 1 inserted into the cassette inserter 9
The tape cassette 12 inserted into the cassette inserter 9 has an abutting portion 19 on the other end.
It has a retaining pawl portion 20 that engages with the lug hole.

Further, a plate-shaped locking member 21 is rotatably mounted on the lower surface of the rotating plate 8 coaxially with the spring receiving member 15. This locking member 21 includes a contact piece 22 located on the line of motion of the ejecting member 16, and a locking member that selectively locks the upper edge of the side wall of the main board 1 to lock the cassette holder 7 in the operating position. 23, and is constantly biased by a tension spring 24 to rotate in a direction in which the locking portion 23 is locked to the upper edge of the side plate of the main board 1.

FIG. 2 is a side view of FIG. 1 viewed from the direction of the arrow ■. However, the motor 4 is omitted.

As shown in FIG. 2, an eject operation member 25 is attached to the outer surface of the side plate of the main board 10 so as to be movable forward and backward in the left and right directions in FIGS. 1 and 2. Eject operation member 25
has a retaining portion 26 bent at the left end position, and is connected to the spring receiving member 15 via a connecting rod 27.

Further, this eject operation member 25 is biased to the right at the time n by a return spring 28 made of a tension spring. When the eject operation member 25 is moved in the right direction (return direction) by the return spring 28 as shown in FIGS. 1 and 2, the spring receiving member 15 is moved in the right direction as shown in FIG. When the eject operating member 25 is moved to the left (backward direction) against the return spring 28, the spring receiving member 15 is also rotated to the left (forward direction) at the same time. Become.

Further, a plate-shaped operating force transmitting member 29 is attached to the outer surface of the side plate 52 of the main board 1 at a position below the eject operating member 25 so as to be movable in the left-right direction in FIG. The operating force transmitting member 29 is always urged rightward by a return spring 30 made of a tension spring. When the eject operating member 25 moves to the left, the operating force transmitting member 29 receives the pressing force of the operating member 25 at the pressure receiving portion 3 and moves to the left together with the operating member 25. The operation force transmission member 25 has a switch operation piece 32 and a bent retaining piece 33, and the switch operation piece 32 connects a tape recorder and a radio (not shown) arranged in parallel thereto. Operate a changeover switch (not shown) to make the changeover. That is, when the operation force transmission member 29 is moving to the left as shown in FIG. 2, the changeover switch enables the radio, and when the operation force transmission member 29 is moving to the right as shown in FIG. The switch enables the tape recorder.

Further, on the outer surface of the side plate 52 of the main board 1, a plate-shaped interlocking member 34 is provided at a position in front of the eject operating lever 25 and the operating force transmitting member 29 (left position in FIG. 2), and is rotatable about a shaft 35. It is attached freely. This interlocking member 3
4 is in contact with a connecting pin 37 that fits into a long groove 36 provided in a side plate portion of the rotating plate 8 of the cassette holder 7 and a retaining portion 26 of the eject operation member 25 from the right side in FIG. It has a pressure receiving piece 38 that receives the pressing force from the return spring 28, and retaining protrusions 39 and 40 located before and after the retaining piece 33 of the operating force transmitting member 29, and is operated by a cassette pressing spring 41 made of a tension spring. It is always urged to rotate counterclockwise in FIG.

Next, the structure of the chive type discrimination mechanism will be explained with reference to FIG. Figure 5 is a plan view showing a state in which the cassette holder 7, eject operation member 25, etc. are removed from Figure 1.A head mounting plate 51 is installed on the main board 1, and on this head mounting plate 51, is supported by the magnetic head 5 described above. The head mounting plate 51 is configured to be able to reciprocate in the direction (in the direction shown by the arrow in FIG. 5) of moving the magnetic head 5 toward and away from the tape in the chip cassette 12. 12 to move forward, and to operate the eject operating member 25 to move backward. Side wall 5 on the main board 1
A detection arm 53 is attached to a portion near the bottle 53 so as to be rotatable around the bin 53A. Note that this side wall 52 is erected close to the cassette holder 7. An elastic piece 54 is integrally formed at one end of the detection arm 53, and the detection arm 53 is urged to rotate in the direction br in FIG. 5 by the elastic force of the elastic piece 54. On the other hand, from the main board 1 side, a locking piece 55 is bent to restrict the amount of clockwise rotation of the detection arm 53 due to the elastic force of the elastic piece 54. Further, a protruding piece 56 from the main board 1 is located at the opening 5 of the detection arm 53.
It is erected through 7. Therefore, the detection arm 53 is allowed to rotate counterclockwise against the biasing force of the elastic piece 54 within the range where the protruding piece 56 comes into contact with the lower edge 57A of the opening 57 in the figure. The detection arm 53 has a detection portion, that is, a detection tongue piece 58 located near the opening 57.
is formed by bending. This detection tongue piece 58 has a tip 58A.
is oriented in the 9-reel shaft 2g, 2b direction f, and its tip M58A fits into a recess formed on the back surface of the housing of the specific tape cassette. Further, the detection tongue piece 58 is configured such that a portion thereof protrudes outside the side wall 52 through an opening 52k formed in the side wall 52, so that it does not interfere with the reciprocating movement of the cassette holder 7. It has become.

On the main board 1, there is a mounting plate 51 connected to the detection arm 53.
A rotating member 59 is disposed rotatably about a pin 60 at the top of the tip 5JA. When the head mounting plate 51 moves forward, the tip 951k contacts one end 59k of the rotating member 59, causing the rotating member 59 to rotate clockwise in the figure. This rotation of the rotating member 590 causes the rotating member 5 to
The other end 59B of the detection arm 53 presses its tip against the elastic piece 61 of the detection arm 53, thereby urging the detection arm 53 to rotate counterclockwise against the urging force of the elastic piece 54. If the tape cassette 2 loaded at this time is a specific tape cassette that stores a specific tape, a recess is formed on the back of the housing, so the tip 58A of the detection tongue 58 fits into the recess. The detection arm 53 rotates counterclockwise without being restricted in its rotation.

By rotating the detection arm 53 in the counterclockwise direction, the operating piece 62 protruding from the side opposite the detection tongue piece 58 of the detection arm 53 as shown by the two-dot chain line in FIG. The switch 63 is biased downward in the figure to turn it on. When the tape type discrimination switch 630 is turned on, the multicontrol mechanism 64 is actuated to select the recording/playback operation corresponding to the specific tape.

On the other hand, if the loaded tape cassette 12 is a tape cassette other than the specific tape cassette,
Since no recess is formed on the back surface of the cassette housing, the tip 58A of the detection tongue 58 collides with the back surface of the housing, and the counterclockwise rotation of the detection arm 53 is prohibited. Therefore, the tape type discrimination switch 63 is not turned on, and the state in which the recording/playback operation corresponding to the tape other than the specific tape is selected is maintained. Note that the urging force acting on the detection arm 53 at this time is due to the elastic piece 61.
is absorbed as elastic deformation.

The operation will be explained based on the above configuration.

1 and 2 show a stopped state, in which the eject member 16 is moving in the m-movement direction (rightward in the figure) due to the elasticity of the eject spring 18. In addition, the cassette holder 7 is at a stop position separated from the main board 1, and the locking part 23 of the retaining member 21 locks on the upper edge of the side root of the main board 1, preventing the cassette holder 7 from moving to the operating position. are doing. Further, the spring receiving member 15 is connected to the connecting rod 2.
7 and the return spring 28 via the eject operation member 25.
The ejecting spring 18 is moved in the backward movement direction (in the direction of accumulating the ejecting spring 18). On the other hand, the operating force transmitting member 29 has its engagement piece 33 in contact with the engagement protrusion 40 of the interlocking member 34, and is prohibited from returning to the right in the figure by the return spring 30.

Note that the interlocking member 34 is biased to rotate in the counterclockwise direction in the figure (the direction in which the cassette holder 7 is moved to the operating position) by receiving the elasticity of the return spring 30 and the cassette pressing spring 4; The rotation of is prohibited by the paper base between the long groove 36 and the connecting bottle 37.

At this time, the tape type discrimination mechanism is in a state as shown by the solid line in FIG. Then, the detection tongue piece 58 of the detection arm 53 partially protrudes outside the side wall 52 through the opening 52A of the side wall 52. The recording/playback operation compatible with CHIBU is selected.

Therefore, when the tape cassette 12 is inserted into the cassette holder 7 through the cassette insertion/ejection opening 11, facing the longitudinal direction and being approximately parallel to the main board 1, this tape cassette 1
The abutting portion 1 of the ejecting member 16 located on the insertion edge of 2
9 is pressed by the tape cassette 12, the eject member 16 moves forward against the iso-eject spring 18.

As the eject member 16 moves, the amount of elastic deformation of the eject spring 18 gradually increases, and when the amount of elastic deformation exceeds the maximum position, the eject spring 18
The elastic force acts to move the eject member 16 in the forward direction. Therefore, no force is required to push the tape cassette 12, and the tape cassette 12 is drawn into the cassette holder 7 by the elastic force of the eject spring 18.

Subsequently, the ejecting member 16 touches the abutting piece 22 of the locking member 21.
The locking member 2 is rotated against the tension spring 24 while still in contact with the tension spring 24. Therefore, the locking part 23 of the locking member 21 comes off the upper edge of the side plate of the main board 1 (see FIG. 3), and the cassette holder 7
The rotating plate 8 and the interlocking member 34 rotate downward under the elastic force of the return spring 30 and the cassette pressing spring 41,
As a result, the cassette inserter 9 is also lowered to move the tape cassette 12 onto the reel shaft 2a.

2b and the cab stan shafts 3h and 3b (see Fig. 4).

Figures 3 and 4 (side view of Figure 3 viewed from the arrow ■ direction)
indicates a cassette loading state, that is, a state in which the cassette holder 12 has moved to the operating position. In this state, the engagement piece 33 of the operating force transmitting member 29 is disengaged from the engaging protrusion 40 due to the rotation of the interlocking member 34, and the operating force transmitting member 29 is returned to the right direction in the center by the return spring 30. Also, at this time, the changeover switch (not shown) is switched by the movement of the switch operation piece 32, and the tape recorder becomes operable.

Further, the retaining portion 26 of the eject operation member 25 or the pressure receiving piece 38 of the interlocking member 34 is pressed by the elastic force of the return spring 28, and this pressing force is applied in a direction to rotate the interlocking member 34 counterclockwise in FIG. act.

On the other hand, the elastic force of the eject spring 18 is transmitted to the eject operating member 25 via the connecting rod 27, but like the return spring 28, this elastic force is also transmitted to the eject operating member 25.
5 to the right, and further acts to the interlocking member 34 in a counterclockwise direction.

In this way, the elastic forces of the return spring 28 and the eject spring 18 act on the interlocking member 34 to rotate it counterclockwise in cooperation with the cassette pressing spring 41, and further move the rotation plate 8 clockwise. It acts to rotate. Therefore, the cassette inserter 9 is biased toward the main board 1 by the elastic forces of the return spring 28, the eject spring 18, and the cassette presser spring 4, and the tape cassette 12 inserted therein is stably held at the loading position. It comes to hold.

In addition, the motor 4 is started by the switching of the switching switch, one reel shaft (2a4 or 2b) and both cag stun shafts 3a, 3b start rotating in a predetermined direction, and at the same time, the magnetic head 5 is in the differential position. The pinch roller (6 & or 6b) on the same side as the reel shaft that moves in the direction of the cassette 12 and contacts the magnetic tape, and receives the rotational force of the motor 4, is moved toward the corresponding capstan shaft (ja or 3b). )
The recording or playback mode is established.

When the tape cassette 12 is loaded in the predetermined position as described above, the tape type discrimination mechanism described above operates as follows. That is, when the tape cassette 12 is loaded into a predetermined position by the cassette holder 7, the forward movement restriction of the head mounting plate 51 is released, and the head mounting plate 51 moves forward. As a result, the magnetic head 5 comes into contact with the tape in the tape cassette 12, and the motor 4 is started, as described above. Then, due to the forward movement of the head mounting plate 51, the tip 51 of the head mounting plate 51) or one end 59 of the rotating member 59
The rotating member 5 is in contact with A as shown by the two-dot chain line in FIG.
9 rotates clockwise in the figure. If the currently loaded tape cassette 12 is a specific tape 70 cassette containing a specific tape, since a recess is formed on the back of the housing, the elastic piece 6 is rotated by the rotation of the rotating member 59.
1, the detection arm 53 rotates counterclockwise in the figure, and the tip 58A of the detection tongue 58 fits into the recess on the back surface of the housing. Then, as the detection arm 53 rotates, the action piece 62 biases the tape type discrimination switch 63 to turn it on. The ON operation of the tape type discrimination switch 63 activates the control mechanism 64 to select the recording/playback operation corresponding to the specific tape.

On the other hand, if the loaded tape cassette 12 is a tape cassette other than the specific tape cassette, the detection arm 53 will rotate counterclockwise in the figure since no recess is formed on the back of the housing. Even so, the tip 58A of the detection tongue 58 collides with the back surface of the housing, and the rotation of the detection arm 530 in the counterclockwise direction is restricted. Therefore, the operating piece 62 is stopped at the position shown by the solid line in FIG. 6, and the tape type discrimination switch 63 is not energized and turned on. At this time, although the detection arm 53 is restricted from rotating counterclockwise, a biasing force is transmitted from the rotating member 59 side. This biasing force is absorbed as elastic deformation of the elastic piece 6. Therefore, the health of the detection arm 53 is maintained.

In this way, when the tape cassette 12 is loaded into a predetermined position by the cassette holder 7, the type of tape is automatically determined, and the recording/playback operation corresponding to the type of tape is selected.

According to the cassette tape recorder according to this example,
The loaded tape cassette 12 can be meta-discriminated, and the recording/playback operation corresponding to the type of tape can be automatically selected.

This eliminates the conventional troublesome task of having the operator check the presence and location of the recess on the back of the housing to determine the type of tape before loading the tape cassette 12, and then switching the electrical circuit accordingly. This makes it possible to prevent erroneous judgments and erroneous operations, and to improve operability. In the case of this embodiment, even though the space on the main board 1 is very narrow, it is possible to realize a tape type discrimination mechanism with a simple configuration without any hindrance to other functions. In particular, an opening 52A is formed in the side wall 52, and the detection tongue 58 of the detection arm 53 is inserted into the opening 52A before the cassette holder 7 is loaded into a predetermined position. ? Since a part of the cassette holder 7 is located outside the side wall 52 via the cassette holder 7, forward movement of the cassette holder 7 is not hindered.

〔Effect of the invention〕

As detailed above, according to the cassette tape recorder according to the present invention, it is possible to automatically distinguish between a specific tape cassette containing chrome tape, metal tape, etc. and other tape cassettes, and to select the corresponding recording/playback operation. There is no need to check whether there is a recess on the back of the cassette housing and its position before loading the tape cassette, as is the case in the past, and as a result, misjudgment and erroneous operation can be prevented. At the same time, it is possible to obtain a cassette type tape recorder with good operability and high reliability by eliminating troublesomeness during use. Furthermore, although the main board is a narrow space, it does not interfere with other functions, especially the reciprocating movement of the cassette holder, and a desired tape type discrimination mechanism can be realized with a simple configuration.

[Brief explanation of the drawing]

1 to 6 are diagrams showing one embodiment of the present invention, in which FIG. 1 is a plan view of a cassette tape recorder, FIG. 2 is a view taken in the direction of arrow ① in FIG. 1, and FIG. 3 is an operation. A plan view showing the condition,
4 is a view taken in the direction of the {circle around (2)} direction in FIG. 3, FIG. 5 is a plan view of the Q-F type discrimination mechanism, and FIG. 6 is a plan view showing the operation of the tape type discrimination mechanism. 1...Main board, 2h, 2b...Reel shaft, 3&. 3b... Capstan shaft, 5... Magnetic head, 7.
...Cassette holder, 12...Tape cassette, 5...Head mounting plate, 52...Side wall, 53...Detection arm, 58...Detection tongue piece (detection part), 62... Action piece, 63... Chive type discrimination switch, 64...
Control mechanism. Applicant's representative Patent attorney Takeshi Suzue On part Figure 1 Figure 2 Figure 3 Concave Figure 4

Claims (1)

[Scope of Claims] A main board equipped with a tape drive mechanism including a reel shaft and a capstan shaft into which a tape cassette is loaded, and a tape cassette mounted on the main board so as to be able to reciprocate in the axial direction of the reel shaft. a cassette holder for loading the tape cassette onto a reel shaft and a capstan shaft by holding and moving forward and detaching the tape cassette from the reel shaft and capstan shaft by moving backward; and a cassette holder that supports a magnetic head. A head mounting plate that is mounted on the main board so as to be able to reciprocate in the direction of moving the magnetic head toward and away from the tape in the tape cassette, and is prohibited from forward movement when the cassette holder is at the tape cassette removal position. a side wall having an opening in a portion thereof and standing close to one side of the cassette holder at a position opposite to the magnetic head with respect to the reel axis of the main board; and a cassette holder on the side wall. an eject mechanism attached to the opposite surface to move the cassette holder back from a tape cassette loading position to a tape cassette removal position; and an eject mechanism rotatably installed near the side wall of the main board and having a detection section at one end. and is normally retracted to a position away from the trajectory of the cassette holder through the opening in the side wall,
By moving the magnetic head of the head mounting plate in the direction of contacting the tape in the tape cassette, rotation biasing force is applied via the elastic member, and a specific tape cassette having a recess at a predetermined position on the back surface of the cassette housing is loaded. A detection arm that rotates by fitting the detection section into the recess when the detection arm is rotated, and a tape type discrimination switch that is biased by the detection arm and operates to switch when the detection arm rotates. A cassette tape recorder featuring: