NL8100590A - ZOOM LENS SYSTEM. - Google Patents

Description

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The invention relates to a zoom system, comprising movable optical buzzers and a cam member for controlling the movement of the optical zoom members, the member being provided with a buoy cam groove in a first predetermined angular region 5 for controlling the movement of the Optical kisses according to a predetermined first dressing for operation of kiss operation and a macro-fusion sermon sniff array in a predetermined second angular region following the predetermined first angular region for controlling the movement of the optic kissers of one end 10 of the pre-coated first bandage according to a pre-bonded vein bandage then of the first band differing from editing after focusing in an area of racrophotography, collective agreement is located in an area of ordinary photography, whereby beo sirogeaeeize of the macro-fecus serin's struggle connected is just no -ircged —— ne <arie zo ^ nmo *. - '5 groove.

With a similar sailor system, a razor soenveroen a focus serving eyes for macro — fetog rat is _ _. ^ * _Λ «i-r fftv * -», 2v> »- 'ft. ▼' • evi

The invention oeocgz a zcc.an_so - 31—— '- the buzzer · --- - -to the macro-focusing effect, dao da accordingly-

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The invention is elucidated with reference to the drawing, in which: Fig. 1 is a schematic representation of the optical zooming members of the lens lens system according to the invention; Fig. 2 shows the beam path through the kiss lens system according to the invention, wherein (a) shows the lens used as a normal focusing lens and (b) shows the application for macro photography; Fig. 3 shows a cross section through a conventional buoyancy house; Fig. B shows a conventional cam ring; Figures 5 and 6 show cam rings according to the invention; and Figures 7 and 8 show an embodiment of the zoom lens system according to the invention which can be used for macro-photgraphics.

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The seeding system shown in Figure 1 is composed of a positive focus lens group, a negative variable power IS group, a negative compensation lens group, and a positive rear fixed lens group. These lens groups form a cocoa part of the lens lens system, which compensates for the focus movement due to the up and down movement of the caapenization group, and through which the negative caapenization group, which divides the viewfinder light, with respect to the back of the lens. moving the zoom in the forward direction enables macro photography.

In general, it is with the structure shown in Fig. 1, and the structure where the zoom portion is composed of the front positive focusing lens group, the negative variable power lens group h, the negative compensation lens group 13, the rear negative fixed lens group requires that the image magnification of the negative variable power lens group for aacrophotgraphy be positive.

Since at least the above feed value must be met, it is impossible to take a close-up view of an object that is within the fire-2G point distance of the focusses, as close to the object can be approached. Now when the object is within the focal length, an image for the lens group I-5 for variable power, as shown in Fig. 2 'b), is formed by the fouling lens, and this image is taken by the soot within the rear-23 focus F, 'of the group 1 shown. In the case where groups I, -v, form the spherical focus, the formation of the image on the film is necessary, that the composite burnt-out of the groups L_ and 1 coincide with the location of the image that of the object is formed by the lens groups L., and 1 ^. In normal photography, when focusing down a front lens is established, just down the groups L and 1 "formed image is always outside the focus F_1 of the group 1Q, this position of the image coinciding with the composite crann point from greetings I and. 1. as shown in fig.2a.

35 cm there should be bi .; macro-ph otgraphy to become the composite focal point s ÜSo dTEdCltUrid "212 -ijm —-§3 ^ —3 Ï13.SS Cl- of Dig.

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When the composite focal point of a L ^ is at a distance £ from the group, the following relationship for this distance £ is obtained.

1 + 0 e - 0 0y. e2 Ί = ----- 03 + 0U - 030u e 5 Here 03 and 0 ^ denote the refractive power of L3 resp. L · ^ on, e the distance between the main point of and that of.

When> £ to e is differentiated, the following formula is obtained: di 03 (l-0 ^ e) (20 ^ + 03 - 030 ^ e) de (03 + 0 ^ - 030j, e) 2 02, 10 h _ (03 + 0j, - 030 ^ e) 2

When 0 satisfies the vocr value: 4 - ^ 20l <o <0. ——i- =: w (V 2 - 1) - V20 e is obtained: d? - 1 de 15 When the composite focal point of 13 and Lj is moved from outside the ach focal point of Lp to the inner area of the focal point? 0 ', it is therefore possible to make the distance L3 being moved less than the distance over which the actual ssmen- # d- <? set focal point is moved. Crndat - negative, when the distance between I and increment, the distance £ decreases. The combined focal point of L3 and namely moves from outside the focal point of% 81 0 0 59 0 ♦ * -5- the variable power lens group to its inner region.

When the distance between and L · ^ is increased, while L · ^ remains fixed, the distance for moving the variable power lens group can usually be used for buzzing, and it is not necessary to provide an extra space because the macro-photographic power is provided and it is therefore possible to prevent the increase of the outer diameter of the lens.

The structure of the zoom house, in which macro-photography may be provided to the zoom-optical system by means of a cam focusing device, the cam being an extension of a management cam of the emancipation group, which in case of macro photgraphy united with the management cam of the variable power lens group is explained on the edge of fig. 3 — o ·

Fig. 3 shows a cross-sectional view of a specific zoom housing of a conventional zoom system which cannot be used for macro-photgraphy operation. The focus azeescret 1 is a bracha in a focusing ring 1, a part 2 of which is provided with a spiral thread, which with the stirral part of a fixed housing 3, in which the lens group L, is eight, intimate contact 20 times, so that through the fecussatlation o to the fixed house 3 ~ e ar and the focus is achieved. The lens group for the lens is fitted with a lens ring 5 and a cylinder is attached by means of a screw Ό to the expansion ring. The rollers 7 and 9 are provided in a housing 3 in the housing 3, and the rollers can be wrapped around the screws, such as a macaw, at the location of the fixed housing 3. and provided with cam grooves TA and 9A for moving a group and direction in the direction of the optical axis. The riots T e.i 9 are in contact with the neck grooves TA resp. YES.

"Ao" 3 tn - -g. - As shown, the nckrzng - provided with the -5- "^ aor varzaoe_ discourse and the oem-senszegrate YES according to ~~ ——« β - <= · --ο. — e nomme, -ersznae ae re_atzeve azstana X on - op "* 3ons axis, a = variable power group and the ccmnsr-y j Vx.ep —g will be able to change a certain rotatze angle θ" *, and to rotate a fixed huzs 3, the lens groove VT -η ^ / - w »« t ^ „Λ" "2 -" 3 -.-c. '^; - and -> a more excited. oswegsn, * VH.3.2TC "*" ban '-'v * - · c g ** Λ> - 4 \.

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-β- by changing the distances ï, X and Z between the lens groups.

According to the invention, in the case of macro photography, the lens groups are arranged relative to the optical axis such that the distance Y between the lens groups remains constant after zooming, while the distances X and Z are changed. A separate macro photography controller could be provided for this purpose, but from the viewpoint of ease of operation and accuracy this is not desirable. The tolerance of each part is very small, 10-20 µm, and to avoid operating difficulties, simplification of the controls is required.

The embodiment of a lens housing, shown in Fig. 5, provides focusing power for macro photography, has a simple structure with a. small number of parts and thus can be conveniently operated with high accuracy, operation being easy. This embodiment allows for macro-photography by changing only the cam ring of the housing.

The normal buzzing pocket grooves TA and 9A are provided on the cam ring within the angle 9 ^ to move and position the lens group 1 in the direction of the optical axis, while further providing cam grooves JA1 "and 9A within the angle. , in order to keep the position of the lens group L ^ in the direction of the optical axis constant In this structure, the grooves JA ^ and 9pP can be arranged on the same cam ring T in the same manner as the cam grooves TA and 9A and it is therefore possible to accurately provide focus photography for macro photography at low cost.

In macro-photgraphy, by rotating the cam ring k ° ran ΘΛ to 9, u t only moves the compensation lens group in the direction of the optical axis, with X and Z changing and Y remaining constant, which has been added.

In the embodiment shown in Fig. 5, the overlaps between the grooves TA and TA ° and the grooves 9A and 9A ° run along a discontinuous line, as shown by the solid line in Fig. 6. It is therefore unlikely that the movement of the lens groups at these transitions will be separated in an even manner and it is clear that it is more favorable for the transitions to have uniform curves represented by the broken lines in FIG. 6, : I grant read. It is also possible, in order to avoid unbaked, 81 0 0 59 0

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to provide a click or zoom step at the end position of the normal zoom, the point under the angle 9Q.

The zoom housing with the cam ring shown in Figs. 5-6 can be mass-produced with a high degree of accuracy at a low cost, and the housing is very advantageous for a zoom lens with macrophotography capability, since no additional means are required.

As will be apparent from the above description, since the focus power for macro photography is provided by the cam, it is an extension of the control neck for the compensation lens group, which control neck in the case of macro photography with the management neck for the variable power lens group is united, the invention very advantageous, which has been confirmed by both calculations and experiments, when macro photography is realized by moving at least a portion of the compensation lens group backwards in a scom optical system, the The optical system includes at least a positive focusing lens concept, a negative variable power lens group, and a positive compensation lens group.

- a lens kit provided with a home that provides the macro-photographic sealing as described above, FIG. 7 and FIG. The explanation will be given on the basis of a specific structure and the transition from zooming to macro photography will also be sea poem.

In Figs. 7 and 6, the parts corresponding to those in Figs. 3-6 are indicated with the same numbers. The lens group I along the optical axis -> sweeping hair group 1 - is arranged in a frame 1. The outputting of the waistline makes contact with a cam surface 11a of a cam. The cam 11 is carried over a tin 20 mounted on an outer frame 23 of the lens assembly. The camper plane 11a is formed according to the curve of Archimedes. By being attached to a cam outside the lens assembly on a drip member 12, 30 wet on regal wine, Ό0 ^ UT3, Sr ^ .cH "vCnTC. * C is ΊΟιχ fT * og · * Vt ** i ^ 1 through the projection 1 = is shifted, corresponds to the angle of rotation when establishing focus.

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SO limit from just sorg to 12 to limit. Hen plate In, which is joined with oz.iterf reme 23, carries a strut "3" for the viewfinder 0-G1, shown in Fig. 7. Threaded Them - 8100590

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Part b'b along the circumference of the cam ring b makes intimate contact with a zoom gear provided on a drive member (not shown) to rotate the cam ring. The plate member 21 serves to reinforce the cam ring. This plate member 21 is mounted on the circumference of the cam ring U and is provided with the same cam grooves TA and 9A as the cam ring. Pins 8 and 10 (see also Fig. 3) protrude through grooves 7A and 9A and make sliding contact with the inner circumference of the grooves.

A slider 16, having elongated grooves 16b and 16c, is passed through the pins 17 and 20 'mounted on the outer frame 23 and serves as a switchover to macro photography.

This switching member is actuated by a coil spring 18 to make intimate contact with the protrusion Ua on the circumference of the cam ring, the coil spring 18 being arranged between the pin 17 and a pin 19 mounted on the slider 16.

Macro photography is now possible by sliding the member 16, against the pulling direction of the spring 18, from the stop position on the "Wide Angle Area", through the contact of the top end loa of the member 16 with the stopper ^ a, which is mounted on the cam ring U to be released, and then by rotating the cam ring 4 from a focusing stop position on the Wide Angle area to a macro-photo-graphic focusing stop position in order to drive back the compensation system without variable hearing system is being changed.

The transition from ordinary photography to macro-photgraph is 25 can be effected mechanically by a simple operation, by retracting the end 16d of the slide 1c, which is done with the aid of a switching photoro 22. such may be done, which is addressed on the outside of the camera, which includes the lens assembly of the present invention.

* '1, pp. 30 The cam ring b is further notched on the side surface - so that the viewfinder light path 0-0' with toilet rat is disturbed, the ridge cam ring is located in a position between the superposition on the "eej-e Ho— ^ area "and the stop position is at the wide noe ^ sgebiea 01 enter Dij ue mac-o 1 n Λ1 graphic stonosposition. Through this notch 22 the connection between the stub Ua on the cam ring ^ and the slide 1d vs-O - ^ * - **> A | and the cam ring n · is just rotated further in order to obtain a zone veranda onion in which the cam ring can be rotated from the stop position in the Wide area to \ w, 81 00 59 0 * S-> -9- macro-photographic position, by applying macro-photographic information, such as of a color finder up to the viewfinder light path 0-0 'in the above rotatable zone, it is possible to indicate within the viewfinder the state of the camera photo, which is achieved by moving the variable power system, the compensation system or both. the indication in the viewfinder can be 0-0 'away from changes in the image expansion ratio or from the angle of rotation to a large zoom magnification of the zoom ring, etc., in cv there is only one with a prescribed son ratio. the viewfinder opening becomes and accomplished.

As will be apparent from the description, the lens lens housing is provided with the cam ring as shown in Fig. 5-3, very suitable for mass production of a zoom lens assembly with macro-fozo-5 graphics capability, comparing with a degree of accuracy and low cost without the need for an additional separate ί 3 Vp ^ 0SCriZ-SC-wÜ -

Since, according to the invention, a fensivation potential for macro photography is provided by means of cam, which extends from the second cam, it is used for compensation, whereby this oc'ir performs the case of macro-photography with the cam for the dance group. variable power is unified, it is possible to do macro-photgraphy by moving at least part of the compensation lens group backward in a focus - this focus is a focus lens group, a negative dance group For variable - / ermegen and ecosizive ccmnensaoielenssroen cnv & z, and the invention »> fl- ^ - - ^ *“ * * 0 - · «» ** / ΖΞ are particularly useful with a film camera.

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Claims (1)

Zoom lens system comprising movable optical zoom members and a cam member for controlling the movement of the optical zoom members, the cam member being provided with a zoom cam groove in a first predetermined angular region for controlling the movement of the optical zoom members according to a predetermined determined first relationship for working zooming and a macro focusing cam groove in a predetermined second angular region following the predetermined first angular region for controlling the movement of the optical zoom members of one end of the predetermined first relationship a predetermined second relationship different from the first relationship for macro focusing processing in an area of macro photography closer than an area of ordinary photography, the end portion of the macro focusing groove being connected to the end portion of the cam groove, characterized in that the central line of the zoom cam groove (TA, 9A) passes a point corresponding to the stop position of the optical sensors (L,) at the end of the predetermined first relationship and ά $ transfer from the original central line (solid line in Fig. 6) so as to form a moderate crown in a portion adjacent to the macro-focus cam groove (JA ^ 9Pp) before connection to the end portion of that groove (dashed line in FIG. 6). f A 8 1 0 0 5 9 0