JPS5948717A - Zoom lens capable of short distance photography - Google Patents

Abstract

PURPOSE:To simplify structure and to realize precise operation by constituting a cum groove, with which a pin for variable power provided on the operation frame is engaged, with the cam groove of a circumferential groove and an optical-axis-directional cam groove which connects with it. CONSTITUTION:For switching from a normal photography area to a macro photography area, when the operation frame at the shortest focus position W or the longest focus position T in the normal photography area is switched to macro photography areas WM and TM, the operation frame at the position W or M is further turned to the short distance side. Then, the variable power pin 5a is raised from the bottom side of a cam groove 2c1 in an inverted T shape to turn by a necessary mcro turning angle by cam grooves 3b'1 and 3b''1 provided extending upward slantingly from the left and right ends of the cam groove 3b1 of a fixed frame and cam grooves 2c'1 and 2c''1 extending to left and right from the lower end part of the cam groove 2c1 of the operation frame in optical-axis directions.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a 5T zoom lens for close-up shooting, and more specifically, starts zooming, focuses, switches to close-up #/v1 range, The present invention also relates to a zoom lens that allows accurate focusing during close-up photography.

IH zooming and focusing 1. i! This A'' zoom lens, which can perform all of the close-up shadow area forecasting and focusing during close-up photography, was already developed by Kogyo (Japanese Unexamined Patent Publication No. 56-83708) (I
s Enclosure No. 56-85712). However, the former type of zoom lens requires a switching member such as a switching plate or a spring in the middle, although it is operated only by a single operating member, so the structure becomes complicated. This reduces the reliability of switching. On the other hand, due to the variable magnification bin hold part of the zoom rem in the latter case, the variable magnification lens frame must be moved slightly when switching between the image area and the close-up area, so the designed lens position cannot be adjusted. This has the disadvantage that the lens becomes distorted and the lens performance deteriorates.

The object of the present invention is to create a 16d zoom lens by skillfully forming the cam ■ on the identification frame that engages with the mirror mirror and variable magnification bottle at the upper point 1d, and the cam A4 on the operation frame. To provide a zoom lens capable of close-up photography, which largely eliminates the drawbacks of the previous.

Hereinafter, the present invention will be explained based on the further example shown in FIG. 75.

FIG. 1 shows a zoom lens O1 showing an embodiment of the present invention.
It is a sectional view of the upper half of. Note that, in order to make the overall arrangement easier to understand, this projection view is not the same cross-section, but has been cut so that all the engaging pins can be seen.

In FIG. 1, reference numeral 1 denotes a focus lens frame that holds the focus lens 8FL1, 2 an operation frame, 3 a fixed frame that holds a relay lens group L4, 4 a zoom frame, and 5 a variable magnification lens t#L2. 6 is a compensation lens frame for holding the compensation lens group L3, 7 is a crimson case, and 8 is a lens mount member.

Upper Muro Focus Lens Frame 1 is a long lens 1 Tortoise) 1 b
The inner cylinder fHi 1 c and the inner cylinder fHi 1 c are integrated by a common wall at the MtI end, and consist of two perpendicular cylinders. A helicoid screw ld is provided on the inner periphery MK of the tip portion and is screwed into the helicoid screw 3C. The upper i-pi operation frame 2 is 2114 M with an outer cylinder 2b and an inner cylinder 2C of approximately the same length, which are integrated by common use.
Consisting of a sieve, the inside and outside (i2c, 21) as well as the top tj6
7. The outer cylinder 1b of the Orcus lens frame l is fired.>
.

Then, on the inside [l□■] of the outer p42b of the upper HD operation frame 2, the engagement pin 1a which is set m= on the outer periphery of the rear end of the outer station 1b of the upper 8C focus lens 1 is fitted. A cam i11!2bt is provided in the optical axis direction, and the focus lens frame 1 becomes free with respect to the movement of the operation frame 2 in the original axis direction, and only by rotation of the operation frame 2, the upper It is adapted to move in the optical axis direction via a screw 1d. Further, on the inner sleeve of the inner cylinder 2C of the operation frame 2, a second
As shown in the developed view of the figure, on the left side is a V-shaped cam where the variable magnification bottle 5a installed on the diamond-shaped R lens frame 5 comes of age. #j2C+ and same skin 2c.

A wide concave portion 2c2 is provided on the right side of the gate, and the low N of the gate 2c is made of a convex plate having a thickness slightly smaller than the depth of the gate 2c. A stopper member 2d is attached. This stopper material 2d has its upper and lower sides planted on the outer peripheral surface of the fixed frame 3.
This is to precisely regulate the rotational NO range of the operating frame 2 by abutting the a @ (see figure hL3), respectively.

Note that the notches 2e in the left and right upper ll directions of the same stock horn member 2d are made by rotating the operation frame 2 located at the long and short focus side positions of
The Stochahin 3a, which is one of the easiest to make, is for burning. As shown in the exploded view of FIG. 3, on the fixed frame 3, there is a protruding cam 743b in the lower left portion into which the variable magnification bottle 5a is fitted, and above the cam 743b is installed on the outer peripheral surface of the zoom frame 4. A circumferential cam 3b, in which the installed locking bottle 4a (see Fig. 1.4) is fired, is attached to a cylinder 1 installed on the outer circumference concave of the compensation lens frame 6 in the lower part of the stone. Mixing bin 6a1
(See Fig. 1) is a cam in the original axis direction with 1 wide insertion +43bz
are provided extensively. Upper β self sum book' To 4 is fZ
1'+? The outer diameter of the o section becomes *+++ =,
The upstream lens frame 6 is inserted between the small diameter H1l and the upper self-fixing lens 3, and
As shown in the opening/]-, ``1-, in the Osumi part, there is installed a diagonal cam fermentation 4b in which the upper one's father's debt bottle 5a comes of age, and at the lower part of the narrow diameter there is an upper yin vat. An inverted S-shaped cam flange 4bz consisting of cam ridges 4b2 + 4b7t into which an engaging pin 6a2 (see FIG. 1) that is raised above the outer periphery of the lens frame 6 is fitted.
The upper crimson diaphragm case 7 is attached to the rear end tj15 of the upper sleeve compensation lens frame 6 by a mounting screw 7a, and the lens mount member 8 is attached to the above II! ! Tentative 11 with 1 fixed slot and 3! ! It is fixed to the li portion with a mounting screw 8a.

Next, the zoom lens 01 of the present invention configured as described above
The zero effect will be explained using FIGS. 5 and 6.

FIG. 5 shows that the operating frame 2 has a cam groove 2cl in its circumferential direction.
When the variable magnification lens frame 5 is placed at the shortest focus position W in the normal photographing area via the variable magnification pin 5a, the upper one, the variable magnification bin 5a, the cam rM3b+ of the fixed frame 3, and the cam groove 4b+ on the zoom frame 4. This shows the state of engagement. When the operation frame 2 is moved from this state to the right in the figure in the direction of the base axis, the cam ζ#2C moves the /& double pin 5a to the cam r in the L-shaped base axis direction of the fixed frame 3-H. Slide to #3bt and move the variable magnification lens frame 5 to the longest focal point [dT]. In this way, set the upper eye magnification bin 5a to the frame 3.
When the cam r (jt3b+ moves), +ryJ
The zoom frame 4 rotates in the circumferential direction via the cam m41) r in which the father 1u bottle 5a is an adult. At this point, the zoom culm 4 is attached to the retaining pin 4a marked with # on the zoom frame 4.
(Fig. i'i44 #+ll is the cam g in the circumferential direction on the fixed frame 3.
3bs, it does not move in the optical axis direction. When the upper zoom frame 4 rotates, the sleeve [a lens +416] has the engagement pins 6a, f which fit into the cam grooves 4b (see Fig. 6) on the zoom frame 4; The light beam moves in one direction along the cam groove 4b through the cam groove 4b. On the other hand, the engagement pin 6a of the compensation lens frame 6! The engagement pin 6a has a thin film on the outer surface opposite to the
, is in the optical axis direction cam IIσ3b2 (see Fig. 3) on the fixed frame 3 by 11 degrees, so that the compensation lens frame 6 can only be rotated by L1, and only in the optical axis direction. Moving.

Next, we will briefly explain how the upper BI operation frame 2 can be operated to switch from the normal shooting area to macro shooting overhead.

When the operation frame 2 in Fig. 5 above is normally 4) the respective macromedullary areas WM and TM can be accessed from the shape 4 located at the closest focal point w, W, or the longest focal point im Ill of the shadow region. teeth,
The operating frame 2 at positions W and A4, respectively, is rotated from the state shown in FIG. 5 to a further short distance 111U. Then, 'A: The double bottle 5a is pushed up by the bottom of the inverted T-shaped cam front 2c of the operation frame 2, and extends obliquely upward from the left and right ends of the cam edge 3b of the upper identification frame 3. Cam (71ab, '
, ab,'' and a cam m2c, /, 2c in the optical axis direction extending left and right from the lower end of the cam groove 2c of the operation frame 2.
//, it preferably rotates by a required macro rotation angle and stops. FIG. 7 shows each lens group Ll, L2. L3. This shows the groaning of L4. In this way, with this zoom lens, focus adjustment not only in the normal shooting area (W-M) but also in the macro areas WM and TM can be easily and smoothly performed by simply operating the operation frame 2. You can do it properly.

FIG. 8 shows the upper half of the zoom lens according to another embodiment of the present invention. This zoom lens 02
Zoom frame 4 of zoom lens 01 in Fig. 1
The compensating lens frame 6 also serves this purpose. 9E, this zoom lens 02 does not have the zoom frame 4 in the upper gb zoom lens 01, and only the configuration of the compensation lens frame 6 and related parts are partially changed, and the other components are the same as those in the upper gb zoom lens 01. It has almost the same configuration as the zoom lens 01 in Figure 1, so are the same components the same? Stop with "+ sign through" J- and omit the 6th brother, Akira. In particular, the focus lens frame 1 and the operation frame 2 are constructed in exactly the same manner. The fixed frame 13 in the zoom lens 02 of this embodiment has the same shape as the fixed frame 3 of the zoom lens 01, but its cam rf;
As shown in Figure 10, there are some differences. That is, upper m1
1 shoulder fixed frame 13 potato-shaped cam (1η13b, upper i (
^iIt is formed exactly the same as the fixed frame 3 cam (43b), but the other cams 13b2 and 13b3 are
Unlike the cam groove 3b2.3+)3 of the running frame 3, the cam rt413b2 is located on the right side of the cam groove 13b, above.
The inverted S-shaped cam groove 4b2 provided on the zoom frame 4 of the co-zoom lens 01 is provided in an S-shape, and the cam groove 13bB is located above the upper cam groove 131-)2. It is provided in the shape of a 1α line in the direction of the original axis. And, on the outer periphery of the same one, there is an upper H self zoom lens OI.
Stopper pins 13a, 13a2 similar to the stopper pins 3al, 3al of the fixed frame 3 in K are implanted at similar positions 1d. This zoom lens ()2 sleeve fi
The T lens frame 16 is rotatably formed within the fixed frame 13 in a shape that is a combination of the zoom frame 4 and the retractable lens frame 6 in the zoom V lens 01. As shown in FIG. 11, the compensating lens frame 16 includes a cone-shaped cam 1h16b extending diagonally upward to the right, which is substantially similar to the cam groove provided in the zoom frame 4 of the zoom lens 01, in the center of the dome. is provided, and a climbing self-fixing frame 1 is provided on the lower right outer peripheral surface.
An engagement pin 16a that fits into the cam groove 13b2 of No. 3 is implanted. The diaphragm case 17 of the present zoom lens 02 is mounted on the rear end of the compensation lens frame 16 so that it can rotate freely with the lens frame 16 but can move integrally with the lens frame 16 in the optical axis direction. That is, as shown in FIG. 12, an arc-shaped cam hole 16b2 is bored at the periphery of the lens holding line 16c of the rear end iβ of the compensation lens frame 16, and the single case 1
For the seventh front peripheral edge, advance the cam hole 16b and insert the headed hole a.
The same 17a is screwed. Therefore, the frame case 17 is free against the movement of the compensation lens frame 16, and the frame case 17 is placed on the outer periphery of the movement of the lens frame 16 in the direction of the original axis. The engaged pin 17a2 is connected to the cam y in the original axis direction on the upper M self-running frame 13;
13 ba'Ic is adapted to move integrally with the compensation lens frame 16.

Next, the operation of the present zoom lens 020 configured as described above will be explained. Move the operation frame 2 to its cam ((Photo 2c,
and the cam iTt 13 b of the fixed frame 13 to move the variable ↑t op-pin 5a in the direction of the light 11411 and rotate the compensation lens frame 16 via the cam 21t6b of the zoom lens 01. The effect is exactly the same as that of similarly rotating the zoom frame 4 (see FIG. 5). In this way, the compensation lens frame 16 passes through the variable magnification bin 5a to the IL! If +1, the same detective lens frame 16
(The engaging pin 16a of the concave lens frame 16 and the cam 13b on the fixed frame 13 where it becomes adult, (10th and 11th sections l
# II Maru) While maintaining the relationship with the variable magnification bottle 5
a and the upper i cam 13b, and then rotate the cam 13b and the 13b of the zoom lens 01 and 13b.・Caucasian 11゜:, J Hirona ite now. In this case as well, rotate the above H
Cam members 2C1', 2C, II and upper V of Pi operation frame 2
Cam groove 3 on 161 foot frame 3 in self-zoom lens O1
The cam on the opposite frame 13 corresponding to b,', 3b,〃? 4
13b, the force A 1lIv13bl',
13b,” and required from K (D Mac 1: l1lijll
The zoom lens 02 can be switched from the normal photographing area to the macro photographing area by turning the zoom lens 02, just as in the case of the zoom lens 01 shown in FIG. 1 above.

It is our goal to provide an X-M lens that has an extremely simple structure and operates automatically by simply operating the operating frame.

[Brief explanation of the drawing]

Figure 1 is a W1 view of one place in the upper half of the zoom lens showing an example of a cyst according to the present invention. Figure 5.6 is a developed view of each of the zoom frames, and Figure 5.6 is a partial IF+ view of the cam scraps of the bone frame shown in Figures 2 to 4 above. FIG. 8 is a cross-sectional view of the upper half h1≦ of the zoom lens showing another embodiment of the present invention. A9 to 1ilJ are developed views of the operation frame, fixed frame, and compensation lens frame of the zoom lens in Figure 8 above, and Figure 12 is the lens holding line of the compensation lens frame of the zoom lens in upper eye U2 Figure 8. FIG. 01.02...-Zoom lens 1--Fist/Focus lens frame 2...
...Operation frame 2c, 2c, , 2c, ...Cam groove (operation frame) 3.13...Fixed frame "bII"b1'13 b I' a -@ @
11 cam r4 (fixed frame) 6.16...compensation lens frame 5...also borrowed lens frame 5a...variable pin watch applicant Orinokusu Former Gakuenji, 4th leave ceremony, burial person Fujikawa 7 part 2
c1 3rd ward φ Bald 4th ward Horse 9th ward Tsuta 10th ward Procedure amendment (self-motivated) Commissioner of the Patent Office from April 1980 to November 4 Kazuo Wakasugi 1, Indication of the case 1988 Patent B No. 159228 No. 2, Title of invention: Zoom lens capable of close-up photography 3, Name of person performing correction: (037) Orinno (Su Kogaku Kogyo Co., Ltd. 4) Address: Mr. 4, Matsubara 5-5z6t, Setagaya-ku, Tokyo
Name (7655) Fujikawa 7th Department (324-2700) 5. Subject of amendment 1 of "Claims" of the specification and drawing 6, Inclusion of amendment (1) F'+ of the specification! ``Scope of Claims'' has been revised as shown in the attached sheet. (2) In Figure 1f11 attached to Book 1λ, Figures 3, 5, 7, and 10 have been revised to other drawings. 2. Claims Performing a zooming operation by moving straight in the optical axis direction,
An operation frame that performs focus adjustment during normal shooting and transition to the close-up shooting area by rotation around the optical axis, a focus frame that rotates L Nb by rotation of this operation frame, and the above operations. The cam groove provided in the circumferential direction 1/C on the operating frame and the cam groove provided in the optical axis direction on the fixed frame move forward and backward in the optical axis direction as the frame moves straight in the optical axis direction. The matching magnification bin is 4ftl M on the outer circumferential surface.
A lens frame and a sleeve I() that engages with a cam ri& in the optical axis direction provided on the fixed frame so that the lens moves in the direction of the light 111+ of this variable magnification lens and moves back and forth in the optical axis direction. (The free lens frame with the errand bottle protruding from it is J,
III: 4. After moving the operation frame to the short focus side or long focus side, rotate it to the short distance side to take a close-up shot of the cam groove on the fixed frame with the upper 6 self-magnification bottle. In a zoom lens capable of close-up shooting, which is configured to move to the upper limit area and enter the close-up shooting state, the cam d, to which the upper I, I, and I ∆ bins set on the upper N tail frame are attached, is It consists of a cam tu in the original 11fl+ direction for normal photography, and a cam groove connected to the cam tu having an appropriate angle in the circumferential direction for close-up photography, with which the variable magnification bin provided on the operation frame engages. A zoom lens capable of close-up photography, characterized in that the cam groove consists of a circumferential cam groove and a continuous cam groove in the optical axis direction. ”

Claims (1)

[Claims] The zooming operation can be performed by moving straight in the direction of the optical axis.
An operation frame that performs focus adjustment during regular shooting and transition to the close-up shooting area by rotating around the original axis; a focus frame that is rotationally driven by the rotation of this operation frame; Bb 47 Along with the IM advance movement in the original axis direction of the operation frame, ti is moved on the circumference 1i11 on the operation frame so that it advances and retreats in one direction.
A cam placed in the direction of the cam and the optical axis on one rectangular frame? 4 -, 1 - The variable magnification bottle is attached to the outer periphery [the variable magnification lens frame built in the river and the original l14 of this variable magnification lens frame]
When moving in the u direction, the upper hU, - sleeve reversing attachment bottle is protruded to attach a string to the cam bolt in the original axis direction housed on the rectangular frame so that it escapes in the original axis direction with =m. If the operation frame is moved to the short focal length side or the long focal length 1111J, then by rotating it toward the mountain side, the magnification changing bin can be moved onto the upper H-leg frame. In a zoom lens capable of close-up photography, which is set to the cam (H) capable of close-up photography, the cam direction engaged by the upper magnification pin provided on the upper 0-pin fixed frame is The cam groove consists of a cam groove in the direction of the base axis for normal photography, and a cam front that has an excessive chamber angle in the circumferential direction for close-up photography. This zoom lens is capable of close-up photography and has a t++ model in which the cam shaft with which the stopper pin engages has a cam direction in the IN direction and a cam groove in the optical axis direction that is continuous with the cam direction.