JP2585084Y2 - Meshing adjustment device for screw feed mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engagement adjusting device of a screw feed mechanism for engaging a needle supported by a linearly moving member with a lead screw and converting the rotational movement of the lead screw into a linear movement.

[0002]

2. Description of the Related Art This type of screw feed mechanism is
By connecting the needle to, for example, a lens group of a camera device, a desired operation such as zooming can be performed by moving the lens group in the optical axis direction by rotating a lead screw.

In such a screw feed mechanism, for example, when an impact or vibration is applied when the needle is not properly engaged with the lead screw, the needle jumps from the engaged position, and an appropriate step between the needle and the lead screw is performed. The position may go wrong. In such a case, a problem occurs in that the lens group cannot be appropriately moved in the optical axis direction.

[0004]

The object of the present invention is to provide a mesh feed adjusting device for a screw feed mechanism which can easily adjust the needle to always move properly along the lead screw based on the awareness of the problem with such a screw feed mechanism. The purpose is to provide.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a screw feed mechanism for engaging a needle supported by a linearly moving member with a lead screw and converting the rotational motion of the lead screw into a linearly moving motion. Linear adjustment means for supporting position adjustment in a direction perpendicular to the axis of the lead screw; and rotation adjustment means for supporting the needle so as to be capable of rotating and fixing in a plane including the needle. Features.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. FIG. 8 is a plan view of the camera device 11 to which the present invention is applied. The camera device 11 includes a base (not shown)
There are three groups before and after a first group lens L1, a second group lens L2, and a third group lens L3. First group lens L1
The second lens group L2 and the third lens group L3 move in a predetermined relationship in the optical axis direction to perform zooming. After zooming, the group lens L2 moves in the optical axis direction to perform focusing. The base further includes a second lens group L
A second group drive unit 13 for moving the second group 2 in the optical axis direction;
A third group drive unit 15 for moving the third group lens L3 in the optical axis direction is provided. Note that O in FIG. 8 is the optical axis.

A screw feed mechanism that converts the rotational movement of the lead screw 22 into a linear movement through the needle 41 and moves the second and third lens units L2 and L3 in the optical axis direction is provided on a base. A needle 41 to be engaged with the lead screw 22 having the lead screw 22 provided in parallel with the moving direction of the lens units L2 and L3;
Are supported by the linearly moving members 36 and 37, respectively.
The rectilinear moving members 36 and 37 include a second lens unit L and a third lens unit L.
2 and L3 respectively.

The lead screw 22 has two ends,
Core shaft 2 rotatably supported by support member 23 and drive unit mounting plate 24 provided before and after in the optical axis direction, respectively.
5 and a pair of first and second screw shafts 26, 2
7. These two screw shafts 26, 27
The needles 41 connected to the second group lens L2 and the third group lens L3 are meshed with the male screws 26b and 27b, respectively, and the needle 41, that is, the second group, Third lens group L
2. L3 can be moved in the optical axis direction.

The screw shafts 26 and 27 have hollow portions 26a and 27a formed along the axial direction, respectively. The core shaft 25 is penetrated through the hollow portions 26a and 27a, and is arranged in a straight line. Are located.
The core shaft 25 has a drive gear 31 fixed to a portion adjacent to the drive unit mounting plate 24. The first screw shaft 26 is provided with the male screw 26b and a head 26c having no male screw 26b, and the head 26c has a fixing screw hole 26d into which the fixing screw 29 is screwed. They are provided orthogonally.
The first screw shaft 26 is restricted in relative rotation with respect to the core shaft 25 by strongly screwing the fixing screw 29, and is fixed to the core shaft 25.

The second screw shaft 27 has its front end in the axial direction abutted against the head 26 c of the first screw shaft 26 fixed to the core shaft 25, and is restricted from moving in the axial direction. The drive gear 30 is fixed at the rear end in the axial direction. That is, the first screw shaft 26 is fixed to the core shaft 25 and can rotate together with the core shaft 25, and the second screw shaft 27 is
, The two screw shafts 26 and 27 can make rotational movements independent of each other.

The second drive unit 13 and the third drive unit 15 are commonly supported by one drive unit mounting plate 24. The second group drive unit 13 has a reduction gear train 32 and a first drive motor 33 for applying a rotational driving force to the reduction gear train 32. The third group drive unit 15 has a reduction gear train 35 and this reduction gear train. A second drive motor 34 for applying a rotational drive force to the gear train 35 is provided. Reduction gear train 32
Is connected to the drive gear 31 via a transmission gear 46 projecting forward of the optical axis from the drive unit mounting plate 24, and the reduction gear train 35 is provided with a transmission gear projecting forward of the optical axis from the drive unit mounting plate 24. The driving gear 30 is interlocked with the driving gear 30 via a gear 49. First and second drive motors 33, 3
Reference numeral 4 denotes a rotation detection sensor 50, 5 provided at the rear of the rotation shaft.
The number of rotations is respectively detected by 1 and drive control is performed based on the detected value.

Next, referring to FIGS. 1 to 7, a description will be given of an engagement adjusting device which is a feature of the present invention. This meshing adjustment device includes a meshing angle of the needle 41 with respect to a lead angle of the lead screw 22 of the screw feed mechanism, and a needle 41 in a direction orthogonal to the axis of the lead screw 22.
Is adjusted.

The linear moving member 36 supporting the second group lens L2, and the linear moving member 3 supporting the third group lens L3
7 is a needle support plate 42 for fixing the needle 41, and the needle support plate 42 is connected to the lead screw 2
2 has a rotation fixing portion 38 that supports the lead angle of the two screw shafts 26 and 27 (the angle formed by the plane perpendicular to the axis and the spiral groove of the external threads 26b and 27b) so as to be capable of rotating and fixing. ing.

The needle support plate 42 is attached to the rotation fixing portion 38 via an attachment screw 40, is formed in a substantially rectangular shape in plan view, and has two circular arcs at rotationally symmetric positions around the opening 42d. A long hole 42c is formed, and a mountain-shaped portion C is formed at the center. The mountain-shaped portion C has the opening 42d at the center, and has a mountain 42a and a valley 42b at both ends sandwiching the opening 42d. The peaks 42a and the valleys 42b are respectively formed by the cuts 4
It is displaced up and down across 2e to form a gap.
By fitting both ends of the needle 41 into the gaps formed at both ends in the vertical direction in FIG. 6 of the needle support plate 42, the needle 41 can be firmly supported by both ends support.

The needle supporting plate 42 has the arc-shaped long holes 42c one by one in left and right flat portions 42f continuous from the mountain-shaped portion C. The needle support plate 42 can further increase or decrease the dimension in the vertical direction (arrow B in FIG. 5) by bending the mountain-shaped portion C in the direction of arrow A in FIG. In the mounting screw 40, the male screw portion 40b is formed to have a diameter smaller than the width dimension of the arc-shaped long hole 42c, and the head portion 40a is formed to have a diameter larger than the width dimension of the arc-shaped long hole 42c.

Therefore, the female screw hole 38a of the rotation fixing portion 38
By rotating the needle support plate 42 while guiding the mounting screw 40 screwed into the circular arc shaped hole 42c, the needle 41 can be rotated in a plane including the needle 41. By bending the needle support plate 42 in the direction of arrow A (FIG. 5), the needle 41 can be arbitrarily set in a direction perpendicular to the axis of the lead screw 22 (for example, Δd).
It can be moved to adjust the position. Further, by fastening the mounting screw 40 in this state, the needle 41 supported by the linearly moving members 36, 37 is adjusted to the lead angle of the lead screw 22, ie, the male screws 26b, 27b, and the spiral of the male screws 26b, 27b is adjusted. It can be fixed in a state of being properly engaged with the groove.

The camera device 11 having the above configuration can be operated as follows. In photographing, first, when the first motor 33 and the second motor 34 are driven to rotate respectively, the rotation reduced by the reduction gear train 32 is transmitted to the drive gear 31 via the transmission gear 46 and is transmitted via the core shaft 25. The first screw shaft 26 is rotated.

Thus, the first screw shaft 26
The linearly moving member 36 having the needle 41 meshed therewith moves forward or backward along the optical axis according to the lead of the screw shaft 26. Further, the rotation reduced by the reduction unit 35 is transmitted to the drive gear 30 via the transmission gear 49 to rotate the second screw shaft 27 to which the drive gear 30 is fixed. Thereby, the linearly moving member 3 in which the needle 41 is meshed with the screw shaft 27
7 moves forward or backward along the optical axis according to the lead of the screw shaft 27. In this case, the needle 41
Are supported at both ends by the needle support plate 42 and are firmly supported as compared with the cantilever support.
b can be properly engaged with the spiral groove.

As described above, zooming is performed by moving the second lens unit L2 and the third lens unit L3 in a predetermined relationship in the optical axis direction. This zooming operation can be performed by simultaneously driving the first motor 33 and the second motor 34 to move the second group lens L2 and the third group lens L3 simultaneously in a predetermined relationship in the optical axis direction. It is also possible to drive any one of the lenses 34 and then drive the other to move the second group lens L2 and the third group lens L3 in order.

Further, after zooming, the first motor 33 is driven at a predetermined timing to move the second group lens L2 in the optical axis direction via the first screw shaft 26,
Perform focusing. When focusing data is obtained during zooming, the second group lens L2
Is moved by an amount obtained by subtracting the focusing data, focusing can be performed together with zooming. Then, the light beams that have passed through the three groups of lenses L1, L2, L3 are incident on, for example, a CCD (not shown).

Further, by the linearly moving member 36 (37),
Lead screw 22, that is, first screw shaft 2
The adjustment of the meshing angle of the needle 41 with respect to the lead angle of 6 (second screw shaft 27) and the position adjustment of the needle 41 in the direction orthogonal to the axis of the lead screw 22 can be performed as follows.

First, the mounting screw 40 is loosened so that the needle support plate 42 is rotatable with respect to the rotation fixing portion 38. Then, the needle 4 is formed by pinching the mountain-shaped portion C or the like.
1 in the direction of arrow B in FIG.
The needle support plate 42 is rotated in an appropriate direction while maintaining the needle support plate 42 at an appropriate position with respect to the spiral groove of the first and second screw shafts 26 and 27 so as to match the engagement angle of the needle 41 with the lead angle of the first and second screw shafts 26 and 27. In this state, the two mounting screws 40 are tightened to fix the needle support plate 42 to the rotation fixing portion 38, respectively.

In this way, by appropriately adjusting the meshing angle of the needle 41 with respect to the lead angle of the first and second screw shafts 26 and 27, and the position of the needle 41 in the direction orthogonal to the axis of the lead screw 22, In addition, it is possible to prevent problems such as an incorrect engagement position being deviated by the action of impact or vibration.

When the engagement state of the needle 41 is adjusted by the engagement adjusting device, the male screw 26b (27
The needle 41 is brought into close contact with the spiral groove in b) in the best condition, and the backlash can be minimized. For this reason, the second group lens L2 (third group lens L3) is made to correspond one-to-one with the rotation of the first screw shaft 26 (second screw shaft 27) both forward and backward of the optical axis. Can be moved.

[0025]

As described above, according to the present invention, the state of engagement of the needle with the lead screw can be easily and appropriately adjusted, so that problems such as tooth jump caused by inappropriate engagement of the needle with the screw shaft can be prevented. This can be prevented.

[Brief description of the drawings]

FIG. 1 is a plan view showing a rectilinear moving member of a camera device to which the present invention is applied.

FIG. 2 is a side view showing the straight moving member.

FIG. 3 is a side view showing the needle support plate in a state where the needle is supported.

FIG. 4 is a perspective view showing the needle support plate in a state where the needle is supported.

FIG. 5 is a front view showing the needle support plate in a state where the needle is supported.

FIG. 6 is a plan view showing the needle support plate in a state where the needle is supported.

FIG. 7 is a front view showing a meshing state of the first or second screw shaft and the needle.

FIG. 8 is a front view showing the entire camera device to which the present invention is applied.

[Explanation of symbols]

 Reference Signs List 11 camera device 22 lead screw 26 first screw shaft 27 second screw shaft 26b 27b male screw 36 37 rectilinear moving member 38 rotation fixing part 38a female screw hole 40 mounting screw 41 needle 42 needle support plate (linear adjustment means, rotation adjustment means) 42a Peak 42b Valley 42c Arc-shaped long hole (straight adjustment means, rotation adjustment means) 42d opening 42e notch 42f flat part C mountain-shaped part (linear adjustment means) L1 first group lens L2 second group lens L3 Third group lens

Claims (4)

(57) [Scope of request for utility model registration] 1. A screw feed mechanism for meshing a needle supported by a linearly moving member with a lead screw and converting the rotational movement of the lead screw into a linear movement, wherein the linearly moving member is perpendicular to the axis of the needle's lead screw. A linear adjustment means for supporting the position adjustment in the direction; and a rotation adjustment means for supporting the needle so as to be able to rotate and fix in a plane including the needle. Meshing adjustment device. 2. The engagement adjusting device for a screw feed mechanism according to claim 1, wherein the linearly moving member has a lens group that moves in the axial direction of the lead screw. 3. The meshing adjustment device for a screw feed mechanism according to claim 1, wherein the linear adjustment means has a needle support plate that supports both ends of the needle. 4. The needle support plate according to claim 3,
It has two arc-shaped long holes formed at rotationally symmetric positions, and adjusts the needle in a direction perpendicular to the axis of the lead screw and adjusts the position of the needle in a state where the mounting screw inserted into the arc-shaped long hole is loosened. A meshing adjustment device for a screw feed mechanism, wherein rotation in a plane including the needle is allowed, and the adjustment position of the needle is fixed when the mounting screw is tightened.