Sharp IV-C35M User Manual page 37

There is a relationships as shown on page 5-4 to page 5-6, among the camera installation distance, the
field of view (in the vertical/horizontal direction), the lens focal length f, the aperture setting, the focal
length, and the resolution.
[Example]
When the IV-C30C5 camera is used, the camera installation distance is 500 mm, and the field of
view (in the horizontal direction) is 110 mm, the optimum lens can be selected as described in the
following procedure. The required information is taken from the table on page 5-4.
Lens focal length f=16mm
Camera
installa-
tion View
distance
(mm)
(mm)
Vertical
450 96.3
500 107.4
600 129.6
1) Selecting the lens focal length f
Follow the line for a camera installation distance of 500 mm for the view (in the horizontal
direction) that is closest to 110 mm, which is 114.6 mm. A 114.6 mm field of view is shown in
the column for a lens focal length f, of 16 mm. Therefore, a lens with focal length of 16 mm is
considered to be optimum.
2) Considering the focal length
The actual focal length, 16.5 mm, is longer than the lens focal length, f = 16 mm, by 0.5 mm.
However, if the camera installation distance of 500 mm is within the focal range (distance from
an object) of the actual lens (f = 16 mm), you can use it.
1. The focus range of the IV-S20L16 camera lens (f = 16 mm) built into the controller is from 50
mm to infinity. Therefore, the camera installation distance of 500 mm is within the focal range,
and the IV-S20L16 lens can be used.
2. When another lens (with a focal range of 16 mm) is used, if its focal range exceeds 500 mm,
install a commercially available C mount close-up shot ring. Use a ring that is 0.5 mm thick
(16.5 - 16 = 0.5 mm).
3) Resolution
When the displayed image fills the whole monitor screen, and the view (in the horizontal
direction) is 114.6 mm wide, the resolution is 223.9 mm.
See "G-9" for the definition of resolution.
Notes
- The values shown in the tables on page 5-4 to 5-6 are only reference data for installation.
These values may vary, according to the characteristics of lenses you are using. When
using any lens, check the data using the actual equipment.
- When the IV-C30C5, IV-S30C3 camera is used.
• If you want to use a camera lens other than the IV-S20L16, buy a lens with a C type lens
base. (The IV-S20L16 has a C type lens base.)
• A lens with too short focal length (f = 4.2 mm or 8 mm) will distort the edges of the field of
view.
- When the IV-S30C4 camera is used
• Use a commercially available ø17 mm lens.
• When a wide-angle lens is used, the distortion at the edges will be larger.
Focal Reso-
length lution
1)
Hori-
(mm) (mm)
zontal
2)
102.8 16.6 200.7
3)
114.6 16.5 223.9
138.3 16.4 270.1
114.6 mm
512 (pixel count)
5-3
Connection and Installation Methods
223.9 m
5