FR2676828A1 - ZOOM CONTROL DEVICE DURING THE EXHIBITION. - Google Patents

Abstract

Device for controlling zoom shooting during an exposure comprising an electric zoom lens controlled by a motor. An exposure value Ev is obtained according to the result of a photometry, and the electric zoom lens is driven in an electric mode according to a programming flow diagram suitable for taking a zoom during an exposure. In the programming flowchart, the shutter speed Tv is fixed between 1 / 15th and 1/4 of a second, which is a speed lower than a usual shutter speed, but when the exposure value obtained by photometry is Too large or too small, the aperture value Av is set to the maximum value or the minimum value so as to determine an appropriate shutter speed.

Description

ZOOM CONTROL DEVICE DURING EXPOSURE

  The present invention relates to a device for

  zoom shot during an exhibition.

  Generally, a zoom photograph during an ex-

  position is taken so that a photographic lens

  that, by means of which a zoom can be carried out, be mounted

  on a camera body, and that simultaneously upon

  shutter latching, the lens is set manually-

  in zoom In this case, the photographer must turn the zoom ring of the lens as gently as possible,

while the shutter is open.

  In such a manual zoom taken during an exhibition

  sition, however, as it is difficult to turn soft-

  the zoom ring during the short opening period

  shutter, it's hard to get a picture

  hated with zoom effect during an exposure.

  Consequently, the object of the present invention is to

  propose a zoom control device during an exhibition

  sition, by which a zoom photograph during an exhibition is taken smoothly, so that a desired photo with zoom effect during an exhibition

is easily obtained.

  According to the present invention, there is provided a zoom control device during an exposure, the device

  comprising means for defining a program flow diagram

  grammage, a means for calculating an exposure value as a function of a result of a photometry, a means for fixing a shutter speed and an aperture value as a function of the exposure value and the flow chart programming, and an electric zoom lens taking the zoom shot during the opening of the shutter, said zoom shot being controlled according to the speed of

  the shutter and the value of the aperture in the organizational

  programming gram, a shutter speed has a value

  their own to zoom in during an exhibition.

  Furthermore, according to the present invention, there is provided a device for controlling zoom during an exposure, the device comprising an electric zoom lens, a means for defining a programming flowchart, a means for calculating an exposure value as a function of a result of a photometry, a means for fixing a shutter speed and an aperture value as a function of the exposure value and the programming flow diagram, and a means for controlling the electric zoom lens to take a zoom shot, while opening

  the shutter, based on the shutter speed and the

  their of the aperture fixed by the adjustment means In the programming flow diagram, a shutter speed

  enough to allow zoom during an exposure.

  In addition, according to the present invention, there is provided a zoom lens control device, the control device comprising means for defining a programming flowchart for a zoom shot during a

  exposure, a means of determining a shutter speed

  aperture value according to the organization

  same of programming and an exposure value obtained from V after a result of a photometry, and a means for controlling the zoom lens to take a zoom shot, during the opening of the shutter, according to the

  shutter speed and aperture value.

  In addition, according to the present invention, there is provided a zoom control device during an exposure, the

  device comprising means for carrying out a photome-

  sorts, a means for calculating an exposure value as a function of a result of the photometry, a means for

  calculate, based on the exposure value, an ob-

  lens or an aperture value that is appropriate for zooming in during an exposure, and a lens

  electric zoom zooming in or out

  shutter green, which operation is controlled

  based on the shutter speed and the value of the

  greenery. The present invention will appear better in the light of

  description of preferred embodiments of the invention;

  vention below, with reference to the accompanying drawings, in which: FIG. 1 is a flowchart illustrating a circuit of a camera comprising a device for controlling

  zoom during an exhibition, in an embodiment

the present invention;

  Figure 2 is a timing diagram illustrating a function

  camera operation during zoom during exposure; Figure 3 is a diagram illustrating an example of a

  programming flow chart used during a zoom

during an exhibition;

  Figure 4 is a flow diagram of a main program

  pal; Figure 5 is a flow diagram of a subroutine of a programming line selection operation; Figure 6 is a flow diagram of a zoom program during an exposure; and Figure 7 is a diagram illustrating another example of a programming flowchart used during a zoom

during an exhibition.

  The present invention will now be described with

  reference to the embodiments illustrated in the

sins.

  FIG. 1 illustrates a control circuit of a device

  similar to which an embodiment of the present invention is applied This control circuit comprises a

  central unit (CPU) 10 controlling the entire device

  photo-like, data processing unit (DPU) 20

  controlling photometry and the like, a processing unit

  information unit (IPU) 30 controlling a display, and a central processing unit (lens CPU) 40 controlling a photographic lens Among these microcomputers, only

  the objective CPU 40 is located in the photogra-

  phique; the other CPUs are in the body of the device.

  like photo. The CPU 10 performs various types of sequential commands, an automatic focusing operation, a calculation for an exposure command, etc. To perform these commands, the CPU 10 is connected to an EE circuit 11, a switch circuit 12 , and control circuits for

  motor 13 and 14 The EE circuit 11 produces an im-

  pulse, and a diaphragm adjustment operation is effective

  carried out in synchronization with this The information circuit

  switch 12 has the function of introducing into the CPU 10 a signal from various switches, for example a

  photometry switch and a trigger switch

  shutter valve The motor control circuit 13a

  for the function of driving a mechanical load motor 15.

  The motor control circuit 14 has the function of

  drag a film winding motor 16 and a

  autofocus 17 In addition, CPU 10 is re-

  linked to an electrically erasable programmable read only memory

  ment (EEPROM) 18 storing data such as the number of frames of a film and various correction values, and at

  a plurality of magnets 19 electrically holding the object

  ventilator in the closed position or releasing the mirror

  when the shutter must be opened.

  The DPU 20 is connected to a charge coupled device (CCD) 21, which is a distance measurement sensor,

  and to an integrated photometry circuit 22 emitting a

  general voltage corresponding to the luminance of an object The DPU 20 performs a photometry operation and acts as an interface with the CCD 21 The DPU 20 and the CPU 10 are respectively connected to a display (LED) 23 displaying

  various types of information in the viewfinder.

  IPU 30 is connected to a liquid crystal display

  (LCD) 31, a flash circuit 32 and an inter-

  switch 33 The LCD display 31 is arranged on a surface

  camera body and indicates various types

  weigh of information The function of the switch circuit 33 is to select an exposure control in mode

program or in manual mode.

  The objective CPU 40 is connected to the IPU 30 mounted in

  the camera body, and receives data about

  nant an objective where the objective CPU 40 is powered from-

  then the IPU 30, and outputs the data to the IPU, so that the objective CPU 40 performs various

  calculations based on the information received The CPU obtains

  jectif 40 is connected to a motor control circuit 41 and a switch circuit 42 The function of the motor control circuit 41 is to drive an electric zoom motor 43, in order to electrically drive the objective

  photographic for zoom activation The information circuit

  switch 42 has the function of selecting an electric zoom mode or a manual zoom mode and of setting a mode in which a take in zoom during an exposure

must be performed.

  Figure 2 is a timing diagram illustrating a function

  camera operation while zooming in

exposure.

  By referring to this timing diagram, the trigger for

  fan is pressed in such a way that the switch

  shutter release is set to ON, and therefore

  that the mirror is mounted and the diaphragm value is

  attached to a predetermined opening Then one of the ai-

  shutter lamellae no longer excited, and a

  first shutter strip is then moved, as in-

  indicated by the reference If When a predetermined time has elapsed since the movement of the first strip

  shutter, the zoom motor 43 is driven, as

  indicated by the reference to A The other magnet for lamellae

  then no longer excited, and a second strip

  shutter is therefore displaced, as indicated by the ref-

  rence 52 At the same time, the zoom motor 43 is stopped.

  Consequently, the rotation of the zoom motor 43 starts ap-

  approximately halfway through a period during which

  an exposure is made, so that a zoom shot of the

  rant an exposure is possible Thus, the zoom takes place

  in the second half of the period during which the

turator is open.

  Figure 3 is a programming flow diagram used

  read during zoom during exposure in exposure mode

  realization of the present invention.

  In this diagram, a photograph is generally taken at a shutter speed of 1/15 th of a second (see the

  Pi), which is slower than a shutter speed

  usual shutter speed This shutter speed is determined

  based on test results obtained by taking true

  photos, and is a limit at which a zoom effect during an exposure is perfectly visible on

  a snapshot This means a lower shutter speed

  less than 1/15 th of a second is preferable, and that a vi-

  shutter size between 1/15 th and 1/4 of a second

  de, for example, is suitable for zooming during an ex-

  position. However, a photograph cannot always be

  taken at a shutter speed of 1/15 th of a second.

  Thus, when an exposure value Ev is calculated according to the result of a photometry and is greater than

  "13", which is too high, the opening value

  ture Av is set to "22" as the upper limit or maximum value (see reference P 2), and a photograph is

  taken at a shutter speed corresponding to this

  their maximum opening Conversely, when a value

  exposure is obtained by photometry and is infre

  less than "5", which is too low, the aperture value is set to "1," 'as the lower limit or minimum value (see reference P 3), and a photograph is taken at a speed d shutter corresponding to this

minimum aperture value.

  Thus, the programming flow diagram illustrated on the

  Figure 3 includes a line indicating an open value

  re constant corresponding to the maximum aperture value and a line indicating a constant aperture value corresponding to the minimum aperture value When the exposure value is between "5" and "13", a zoom

  during an exhibition is carried out at a shutter speed

  constant value of 1 / 15th of a second, and the opening value

ture is modified accordingly.

  An operation of the embodiment is described below with respect to the flowcharts of Figures 4 to 6. Figure 4 illustrates a flowchart of a program

main.

  In step 101, the ports of the CPU 10 are initialized, and in step 102, an automatic exposure (AE) is started, i.e. correction data necessary to calculate an exposure command are read from the EEPROM 18 Then, in step 103, data necessary for an automatic focus control (AF) are

read from the EEPROM 18.

  In step 104, the conditions of the various switches, such as a photometry switch and a switch

  of trigger, are read from the inter-

  switch 12 When AF mode has been chosen, AF processing is performed and AF control for the lens

photographic is therefore carried out.

  In step 106, it is determined if 4 ms have elapsed since a predetermined period, and each time 4 ms has elapsed, the processing goes from step 106 to step 107, and it is determined if the trigger switch is set to ON Thus, an ON-OFF condition of the trip switch is checked every

  4 ms, and when it is determined that the power switch

  trigger is ON, a triggering process takes place If it is determined in step 106 that 4 ms has not passed, it is determined in step 110 if 110 ms have elapsed since a predetermined period Steps 104 and are executed when 100 ms have not passed,

  and steps 111 to 113 when 100 ms have passed.

  In step 111, predetermined data is transmitted

  from IPU 30 to CPU 10 This data, for example, includes

  provide information indicating a type of exposure mode

  tion, and information indicating whether a mode of the object

  tif zoom is an electric mode (electric zoom mode) or a manual mode In step 112, a photometry operation is performed, so that an exposure value Ev is calculated from photometry data, and a sub -program of a line selection operation of

  programming (figure 5) and a subroutine of an operation

  EXZP tion (figure 6) of zoom during an exposure, which are described later, are executed In step 113, display data for the LCD display 31 are transmitted from the CPU 10 to the IPU 30, and this subroutine returns

then at step 104.

  Figure 5 illustrates a flowchart of a sub-

  program of a program line selection operation

mation.

  When it is determined in step 121 that the mode of pro-

  gram has not been set, this routine is immediate-

  Conversely, when it is determined by step

  121 that the program mode has been set, processing does not

  at step 122 and it is determined whether an electric zoom lens

  stick mounted on the body of the camera

  123, it is determined whether an electronic zoom lens mode

  stick is fixed in electric mode In step 124, it is

  determined if a mode for taking a zoom during an ex-

  position (Ex zoom mode) is fixed When the electric zoom lens is mounted, the electric mode is fixed and the Ex zoom mode is fixed, the processing goes to step 125 and an indicator to execute a zooming program

  during an exhibition (EXZP operation sub-program, fi-

  gure 6) is fixed Conversely, when any of the conditions determined in steps 121 to 124 is not fulfilled,

  the subroutine is terminated without execution of step 125.

  Figure 6 shows a flow diagram of a program

  for the operation subroutine EXZP.

  On the following flowchart: Lv D corresponds to an exposure value Ev obtained from photometry data as described above,

  Tv D corresponds to a shutter speed, and Av D cor-

  responds to an opening value Lv D, Tv D and Av D are related in an equation Lv D = Tv D + Av D Thus, Lv D is an exposure value for the calculation, Tv D is a value

  shutter for the calculation and Av D is an open value

  ture for the calculation Lv D is determined according to the photometry data, then Tv D and Av D are determined according to a programming flow diagram illustrated in FIG. 3, by

example.

  In step 131, a shutter speed for zoom shooting during an EXZTVD exposure (time value

  Tv corresponding to 1/15 th of a second, for example) is fi-

  xed as Tv D At step 132, Tv D is subtracted from Lv D, to obtain Av D. Then, when it is determined in step 133 that Av D is greater than Av DMAX, which is the maximum value of Av D, the processing goes to step 134 o Av D is made equal to

  Av DMAX When it is determined in step 135 that Av D is less than

  lower than Av DMIN, which is the minimum value of Av D, the

  completely goes to step 136 o Av D is made equal to Av DMIN.

  When it is determined in steps 133 and 135 that Av D is com-

  between Av DMAX and Av DMIN, the subroutine is im-

mediately arrested.

  When Av D is made equal to Av DMAX in step 134 or Av DMIN in step 136, step 141 is executed so that Av D is subtracted from Lv D, to obtain Tv D. Then, when it is determined in step 142 that Tv D is greater than Tv DMAX, which is the maximum value of Tv D, the processing goes to step 143 o Tv D is made equal to

  Tv DMAX When it is determined in step 144 that Tv D is in-

  below Tv DMIN, which is the minimum value of Tv D, the processing goes to step 145 o Tv D is made equal to Tv DMIN When it is determined in steps 142 and 144 that Tv D is between Tv DMAX and Tv DMIN , the subroutine is

immediately stopped.

  Thus, Tv D and Av D are determined according to the organization

  programming gram illustrated in Figure 3.

  As described above, in this embodiment, the zoom shot during an exposure is performed so that the shutter speed is generally fixed, for example, at 1/15 th of a second, and the electric zoom lens is electrically driven while the shutter is open Thus, the period during which the shutter is open is set to a value required for zooming in during an exposure, or as close as possible to this value, and the zooming is done smoothly by an electric control Therefore, a desired photograph with a real zoom effect

  during an exhibition can be obtained.

  It should be noted that although the line Pl of the speed

  shutter is fixed at 1/15 th of a second in the organization

  programming gram of FIG. 3, this line Pl can be inclined as shown in FIG. 7 so that a shutter speed varies as a function of a value

opening hours.

he

  Although the embodiments of the present in-

  have been described here in relation to the an-

  attached, numerous modifications and transformations can

  obviously come from people who

  sées in the art without departing from the scope of the present invention.

Claims (9)

  1 Zoom control device during an exposure, said device comprising:   a means for defining a program flowchart-   mation in which a shutter speed (Tv) has a value   suitable for zooming in during an exhibition; means for calculating an exposure value (Ev) based on a result of a photometry; means for setting a shutter speed and a   aperture value (Av) as a function of said value of ex-   position and said programming flow diagram; and an electric zoom lens taking the zoom shot during the opening of the shutter, said zoom shooting being controlled according to said shutter speed and said aperture value.   2 Device according to claim 1, wherein said programming flow diagram comprises a line indicating constant shutter speed.   3 Device according to claim 2, wherein ladi-   the constant shutter speed is between 1/15 th and 1/4 of a second.   4 Device according to claim 1, wherein said programming flow diagram comprises a line indicating a variation of said shutter speed as a function of said aperture value.   The device of claim 2 or 4, wherein said programming flow chart further comprises a   line (P 2) indicating a constant aperture value cor-   corresponding to the maximum aperture value.   6 Device according to claim 5, wherein said means for fixing said shutter speed fixes it at a maximum value when said shutter speed obtained as a function of said programming flow chart is more greater than the maximum value.   7 Device according to claim 2 or 4, wherein said programming flowchart further comprises a   line (P 3) indicating a constant opening value cor-   corresponding to the minimum aperture value.   8 Device according to claim 7, wherein said means for fixing said shutter speed fixes it at a minimum value when said shutter speed obtained as a function of said programming flow chart is more small than the minimum value.   9 Zoom control device during an exposure, said device comprising: an electric zoom lens; means for defining a programming flow diagram in which a shutter speed is sufficient to allow zooming in during an exposure; means for calculating an exposure value based on a result of photometry; means for setting a shutter speed and a   aperture value as a function of said exposure value   tion and said programming flowchart; and   means (40) for controlling said electric zoom lens   button to take a zoom shot during   the opening of the shutter, according to said shutter speed   erator and said aperture value set by said means adjustment.   Zoom lens control device, said device   control device comprising: means for defining a programming flowchart for a zoom shot during an exhibition; means for determining a shutter speed and an aperture value based on said programming flow chart and an exposure value obtained from the result of a photometry; and   means for controlling said zoom lens for ef-   take a zoom shot, during the opening of the shutter, according to said shutter speed and said aperture value.   11 Device for controlling zoom during an exposure, said device comprising: means for carrying out photometry (20); means for calculating an exposure value based on the result of the photometry;   means for calculating, from said exposure value   shutter speed or aperture value   which is suitable for zooming in during an exhibition   sition; and an electric zoom lens   zoom during the opening of the shutter, which operates   tion is controlled according to said shutter speed and said aperture value.