JP2018045120A5 - - Google Patents

Description

Filter holder unit

  The present invention relates to an insertion / removal insertion filter used for an optical device such as an interchangeable lens.

  Conventionally, since a filter can be made smaller by attaching a filter in the middle of a lens barrel in which the luminous flux is focused rather than attaching a filter to the front lens of the lens barrel, a filter that can be inserted and removed in the middle of the lens barrel. There are interchangeable lenses.

  In recent years, interchangeable lenses and camera bodies often have a dustproof and splashproof structure that prevents water and dust from entering from the outside to the inside. Similarly, the filter holder used for such an interchangeable lens is also required to have a dustproof and splashproof structure.

  Patent Document 1 discloses a simple filter holder having a structure that can be used with a screw-type filter, a film-like filter, or both alone or simultaneously, and can be easily attached to and detached from a lens barrel. .

Japanese Utility Model Publication No. 04-129120

  However, the filter holder described in Patent Document 1 does not consider water and dust that enter the filter holder, and does not include an O-ring or the like for suppressing intrusion. As a result, when removing the filter holder described in Patent Document 1 from the interchangeable lens barrel, the lock pin 25 is held in the holding groove 27 by rotating 90 ° while pushing the detachable knob 15. In this structure, when the detachable knob 15 is pushed in, water and dust attached to the detachable knob 15 enter the inside of the filter holder. From the above, the filter holder described in Patent Document 1 has a problem that even if the camera body or the interchangeable lens barrel has a dust-proof and drip-proof structure, water and dust enter the inside of the filter holder from the periphery. Have.

  The present invention has been made in view of such circumstances, and a filter holder unit having a dustproof and drip-proof function for preventing water and dust from entering from the outside of the filter holder main body to the inside of the filter when being removed from the interchangeable lens barrel. The purpose is to provide.

A first invention which is means for solving the above-described problems is a filter holder base which is a part of an interchangeable lens barrel and in which a filter holder can be inserted and removed, and a filter is detachable. The filter holder unit includes the filter holder that can be inserted and removed, and the filter holder base includes a lock pin, an elastic member that pushes out the lock pin, and an urging force that pushes the filter holder away from the filter holder base. The filter holder has a first engagement portion that engages with the lock pin when the filter holder is inserted into the filter holder base, a filter holder knob, and a filter holder knob shaft. The filter holder has a bearing integral with the filter holder main body, and the filter is attached to the bearing. The filter holder knob shaft portion is provided with an O-ring at a sliding portion with the bearing, and a lock release plate at a lower end thereof, and the lock release plate is provided with the filter holder. The filter holder is fixed to the interchangeable lens barrel by rotating together with the knob and the filter holder shaft, and the lock pin and the first engaging portion are engaged. The engagement relationship between the lock pin and the first engagement portion is eliminated.

A second invention, which is means for solving the above-mentioned problems, is a filter holder unit according to the first invention , and the filter holder further includes the filter and the optical axis O from the first engagement portion. a second engagement portion in the direction of the intersection X of the engagement relationship between the locking pin and said first engaging portion is released by the biasing member, when the filter holder is pushed out, The filter holder is prevented from popping out by engaging the lock pin and the second engaging portion.

A third invention, which is means for solving the above-mentioned problems, is a filter holder unit according to either the first invention or the second invention , and the filter holder further has a locking portion. The locking portion is on a surface of the filter holder main body different from the first engaging portion and the second engaging portion that engage with the lock pin, and the locking portion includes the filter and the filter. It is arranged at a position where the distance from the intersection X of the filter and the optical axis O to the first engagement portion is longer than the distance from the intersection X of the optical axis O to the engagement portion, and engages the lock pin. Thus, it is possible to prevent erroneous insertion of the filter holder.

  According to the present invention, it is possible to provide a filter holder unit having a dustproof and drip-proof function that prevents water and dust from entering the filter inside from the outside of the filter holder main body when it is detached from the interchangeable lens barrel.

The perspective view which concerns on the Example of this invention Sectional drawing of the filter holder 1 which concerns on the reference example of this invention Sectional drawing of the filter holder 1 which concerns on Example 1 of this invention. FIG. 5 is a diagram illustrating the relationship between the first engaging portion 22 and the lock pin 40 of the filter holder 1 according to the first embodiment of the invention. The figure of the latching | locking part B and the 1st engaging part through-hole 221 of the filter holder 1 which concern on Example 1 of this invention.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. In addition, this invention is not limited by this embodiment.

FIG. 1 is a drawing of a filter holder unit 100 according to an embodiment of the present invention. FIG. 1 is simplified to simplify the description of the present invention. Figure 2 is a cross-sectional view of a reference example, FIG. 3 is a cross-sectional view of the first embodiment along the filter holder 1 in Figure 1 A. FIG. 4 is a diagram showing an engagement relationship between the lock plate 122 of the filter holder 1 and the lock pin. FIG. 5 is a view of the engaging portion on the side opposite to the engagement between the lock plate 122 and the lock pin of the filter holder 1.

Note that the vertical direction in the figure is a direction perpendicular to the optical axis, and the horizontal direction in the figure is a direction horizontal to the optical axis. The filter holder 1 in FIGS. 1 to 5 omits the filter itself such as a gelatin filter. 1 and 5, the left side is the object side and the right side is the image sensor side, and in FIGS. 2 to 4, the left side is the image sensor side and the right side is the object side. Further, O in the figure represents the optical axis of an interchangeable lens barrel (not shown), and includes the optical axis of a filter (not shown). An intersection point between a filter (not shown) and the optical axis O is defined as an intersection point X.

Reference example

  The filter holder unit 100 includes a filter holder 1 and a filter holder base 2. The filter holder 1 can be inserted into and removed from a filter holder base 2 that is a part of an interchangeable lens barrel (not shown). The filter holder 1 has a filter holder main body 10 that holds a filter frame 14 in which a filter (not shown) is arranged, and an appearance plate 11 along the outer peripheral surface of the interchangeable lens barrel.

  The filter holder body 10 holds the filter frame 14. A filter is set in the filter frame 14. In this embodiment FIG. 1 to FIG. 5, the filter is not shown.

  The appearance plate 11 has a shape that matches the opening of the filter holder base 2 that is a part of an interchangeable lens barrel (not shown). Further, the filter holder 1 has a buffer material 13 along the opening of the filter holder base 2 to prevent water and dust from entering. The appearance plate 11 is provided with a bearing and supports the shaft 121.

Filter holder knob 12, when inserting the filter holder 1 to the interchangeable lens barrel, the reference example, a knob for operating the locking plate 122 to prevent falling off from the interchangeable lens barrel, in the first embodiment of the present invention, It is a knob for operating the lock release plate 20. In the reference example , when the filter holder knob 12 is rotated, the shaft 121 and the lock plate 122 which is a notch plate rotate together, and the filter holder base in which the lock plate 122 is a part of the interchangeable lens barrel. 2, the engagement state and the engagement release state can be switched. That is, in the engaged state, the filter holder 1 is locked to the interchangeable lens barrel, so that the filter holder 1 is prevented from falling off. In the disengaged state, the filter holder 1 can be extracted from the interchangeable lens barrel. Needless to say, the filter holder knob 12 and the shaft 121 may be integrated or separate.

  The buffer material 13 is a buffer material having a dustproof and dripproof function. The buffer material 13 is disposed between the outer appearance plate 11 and the filter holder base 2 and exhibits a dustproof and splashproof function.

The lock plate 122 used in the reference example is disposed at the lower end of the shaft portion 121, and rotates integrally with the user by rotating the filter holder knob 12 and engages with the filter holder base 2. By this engagement, the filter holder 1 is locked to an interchangeable lens barrel (not shown).

In the reference example , the filter holder 1 can be switched between engagement and disengagement with the filter holder base 2 only by rotation of the filter holder knob 12 and the lock plate 122 that rotates integrally with the filter holder knob 12. Therefore, there is no member that moves back and forth between the inside and the outside of the filter holder 1. As a result, it is configured to prevent water and dust adhering to the outside of the filter holder 1 from adhering to members entering and leaving the filter holder 1 and entering the inside of the filter holder 1 when the filter holder 1 is removed. .

  The lock plate cover 21 has a first engagement portion 22. When the filter holder 1 is inserted into the filter holder base 2, when the user rotates the filter holder knob 12, a part of the lock plate 122 penetrates the first engaging portion 22 and engages with the filter holder base 2. To do. The lock plate 122 in FIG. 2 penetrates the first engagement portion 22 and is in engagement with the filter holder base 2 (not shown).

  The urging member 30 pushes the filter holder 1 in the direction of taking out from the filter holder base 2.

  The O-ring 31 is disposed between the appearance plate 11 and the shaft portion 121 of the filter holder 12. Since the shaft portion 121 rotates integrally with the filter holder 12, a clearance is required between the shaft portion 121 and the appearance plate 11 in order for the shaft portion 121 to rotate. Therefore, by arranging the O-ring 31, water and dust are prevented from entering from the sliding portion of the shaft portion 121 and the appearance plate 11.

Next , Embodiment 1 of the present invention will be described with reference to FIGS.

In the reference example , the lock plate 122 is locked and unlocked with an interchangeable lens barrel (not shown) by switching between engagement and disengagement of the lock plate 122 with the filter holder base 2.

On the other hand, in the first embodiment of the present invention , the filter holder base 2 includes a lock pin 40 and an elastic member 41 for pushing out the lock pin 40. The lock plate cover 21 of the filter holder 1 has a second engagement portion 23 in addition to the first engagement portion 22. The lock pin 40 and the elastic member 41 are disposed at locations facing the first engagement portion 22 and the second engagement portion 23 when the filter holder 1 is inserted into the filter holder base 2. FIG. 4 is a diagram illustrating the relationship among the lock pin 40 and the elastic member 41 included in the filter holder base 2, the lock plate cover 21 included in the filter holder 1, the first engagement portion 22, and the second engagement portion 23. It is. However, the filter holder base 2 is not shown.

In the reference example , the filter holder 1 has been engaged with the filter holder base 2 by the lock plate 122 penetrating the first engaging portion 22. In Embodiment 1 of the present invention , the filter holder 1 is inserted into the filter holder base, and when the user rotates the filter holder knob 12, the lock release plate 20 also rotates together with the lock pin 40 pushed out by the elastic member 41. The filter holder 1 is locked to the interchangeable lens barrel by the engagement of the first engagement portion 22. As a result, the filter holder 1 is prevented from falling off. Further, when removing the filter holder 1, the user rotates the filter holder knob 12 so that the lock release plate 20 rotates integrally, and the lock pin 40 is moved from the first engaging portion 22 against the force of the elastic member 41. By pushing out, the engagement relationship between the first engagement portion 22 and the lock pin 40 is canceled. As a result, the filter holder 1 by the force of the biasing member 30 is pushed out from the filter holder base 2.

  The lock release plate 20 will be described. As described above, when the engagement relationship between the lock pin 40 and the first engagement portion 22 is released in order to remove the filter holder 1, the lock release plate 20 is in a state in which the lock pin 40 is pushed out, and the filter holder When 1 is inserted into the filter holder base 2, the lock release plate 20 is in a direction to receive the lock pin 40.

Furthermore, the lock release plate 20 used in Embodiment 1 of the present invention has a spring member (not shown). By having this spring member, the lock release plate 20 can always maintain the orientation in which the lock pin 40 is received. The lock release plate 20 always maintains the orientation of the state in which the lock pin 40 is received, so that the lock pin 40 and the first engagement portion 22 can always be engaged. That is, when the user inserts the filter holder 1 into the filter holder base 2, it is not necessary to care about the direction of the lock release plate 20.

Next, in the first embodiment of the present invention , the lock plate cover 21 has a second engagement portion 23 in addition to the first engagement portion 22. The second engaging portion 23 is disposed at a position lowered from the first engaging portion 22 in the optical axis O direction of the filter (not shown). By the second engaging portion 23 is present, the filter holder 1 is pushed out by the urging member 30, the second engagement portion 23 and the lock pin 40 is engaged, the filter holder part of the filter holder 1 It stays protruding from the base 2. If the second engagement portion 23 does not exist, the filter holder 1 will pop out vigorously depending on the force of the urging member 30.

  Note that the amount of protrusion when the second engagement portion 23 and the lock pin 40 are engaged and a part of the filter holder 1 protrudes from the filter holder base 2 is the first engagement portion 22 and the second engagement portion 23. It becomes the distance.

Further, in the first embodiment of the present invention , the lock plate cover 21 is used. Needless to say, the two engaging portions 23 may be provided.

The second engaging portion 23 disposed on the lock plate cover 21 of the filter holder 1 is chamfered as illustrated in FIGS. 3 and 4. This is because when the filter holder 1 is inserted into the filter holder base 2, the lock pin 40 is temporarily engaged with the second engagement portion 23 before the filter holder 1 is locked by engaging the first engagement portion 22. It will be in a state to match. At this time, since the second engagement portion 23 is chamfered, the lock pin 40 smoothly moves after being engaged with the second engagement portion 23 and is brought into an engagement state with the first engagement portion 22. The filter holder 1 will be locked.

  Further, by chamfering the tip of the lock pin 40 included in the filter holder base 2, the filter holder 1 is locked more reliably without the lock pin 40 being caught by the second engagement portion 23.

  Further, the urging force of the urging member 30 is set so that the urging force becomes zero in a state where the lock pin 40 is engaged with the second engaging portion 23, so that the second engaging portion 23 is chamfered. Even if it is done, the filter holder 1 can be prevented from popping out.

  As described so far, it is assumed that the filter holder 1 is placed in the filter holder base 2 in the direction in which the lock pin 40, the first engaging portion 22, and the second engaging portion 23 face each other, and the opposite direction. It is assumed that it is erroneous insertion.

Further, in the first embodiment of the present invention , when the filter holder 1 is inserted into the filter holder base 2 in the direction opposite to the direction in which the object side and the image sensor side are originally inserted, that is, when it is erroneously inserted, the lock pin 40 is inserted into the filter holder body 10 The first engaging portion 22 and the second engaging portion 23 are engaged with a surface opposite to the surface on which the first engaging portion 22 and the second engaging portion 23 are disposed. As a result, the filter holder 1 cannot be inserted any more. As a result, it is possible to use the lock pin 40 to prevent erroneous insertion.

  Here, as shown in FIG. 3, the first engagement portion 22 penetrates from the imaging element side to the object side, and a hole on a surface different from the first engagement portion 22 is connected to the first engagement portion through hole 221. To do.

In the first embodiment of the present invention , as shown in FIG. 5, when the filter holder 1 is erroneously inserted, the point B of the filter holder main body 10 in the drawing having the first engagement portion through hole 221 is the locking portion. To play a role. Further, since the point B of the filter holder body 10 is not chamfered, even if the filter holder 1 is inserted into the filter holder base 2, the lock pin 40 contacts and is locked with the point B of the filter holder body 10. Therefore, it cannot advance in the direction which inserts the filter holder 1 before this. From the above, the lock pin 40 is locked by the locking portion at the point B of the filter holder main body 10, and therefore plays a role of preventing erroneous insertion of the filter holder 1.

  The position of the locking portion is the surface opposite to the surface on which the first engaging portion 22 and the second engaging portion 23 are arranged, and from the intersection X between the optical axis O and a filter (not shown), They are arranged on a straight line connecting the joint through holes 221.

  Further, when the first engagement portion 22 does not penetrate the filter holder main body 10 and the first engagement portion through hole 221 does not exist, the plane of the first engagement portion 22 is symmetrical with respect to the plane of the filter (not shown). By assuming the position as the position of the first engagement portion through hole 221, the position of the locking portion can be specified.

  Further, the first engaging portion through hole 221 is chamfered in the filter optical axis direction as shown in FIG. Due to this chamfering, even if the lock pin 40 is inserted into the first engagement portion through-hole 221 beyond the lock portion because the lock portion is scraped or the like, the lock pin 40 remains in the first engagement. It can be easily removed from the through-hole 221. That is, even if the filter holder 1 is erroneously inserted, it can be easily extracted from the filter holder base 2.

From the above, the present invention has a structure that does not require a sliding action when the filter holder 1 is removed from the interchangeable lens barrel. Specifically, there is no member that moves back and forth between the filter holder 1 and the inside. As a result, it is configured to prevent water and dust adhering to the outside of the filter holder 1 from adhering to members that go back and forth inside the filter holder 1 and entering the inside of the filter holder 1 when the filter holder 1 is removed. .

DESCRIPTION OF SYMBOLS 1 Filter holder 2 Filter holder base 10 Filter holder main body 100 Filter holder unit 11 Appearance board 12 Filter holder knob 121 Shaft part 122 Lock board 13 Buffer material 14 Filter frame 20 Lock release board 21 Lock board cover 22 1st engaging part 221 1st 1 engaging portion through hole 23 second engaging portion 30 biasing member 31 O-ring 40 lock pin 41 elastic member

Claims (3)

A filter holder base that is part of the interchangeable lens barrel and in which the filter holder can be inserted and removed;
A filter holder unit that is detachable from the filter holder base and that can be inserted into and removed from the filter holder base;
The filter holder base is
With a lock pin,
An elastic member for pushing out the lock pin;
An urging member that pushes the filter holder away from the filter holder base;
The filter holder is
A first engaging portion that engages with the lock pin when the filter holder is inserted into the filter holder base;
A filter holder knob;
Having a filter holder knob shaft,
The filter holder has a bearing integral with the filter holder main body, and the filter holder knob shaft is pivotally supported by the bearing.
The filter holder knob shaft portion is provided with an O-ring at the sliding portion with the bearing, and a lock release plate at the lower end.
The lock release plate rotates together with the filter holder knob and the filter holder shaft,
By engaging the lock pin and the first engagement portion, the filter holder is fixed to the interchangeable lens barrel,
The filter holder unit, wherein the engagement relationship between the lock pin and the first engagement portion is canceled by the rotation of the lock release plate. The filter holder is
Having a second engagement portion in the direction of the intersection X of the filter and the optical axis O from the first engagement portion;
The first engagement between the engaging portion and the locking pin is released by the biasing member, when the filter holder is pushed out,
Wherein by the lock pin second engaging portion are engaged, the filter holder unit according to claim 1, wherein the preventing the filter holder pops out. The filter holder is
Having a locking part,
The locking portion is on a different surface of the filter holder main body from the first engaging portion and the second engaging portion that engage with the lock pin,
The locking portion is disposed at a position where the distance from the intersection X of the filter and the optical axis O to the first engagement portion is longer than the distance from the intersection X of the filter and the optical axis O to the locking portion. ,
By locking the locking pin, the filter holder unit according to claim 1 or 2, characterized in that to prevent erroneous insertion of the filter holder.