Lobre s.r.l. was set up in Brescia in 1946 by the engineer Simone Marcucci and has been designing lenses and objectives for a variety of applications ever since. Its catalogue includes everything from the simple magnifying glass right up to microscope lenses, those for fixed headlight projector lenses, objectives and numerous other applications.

Commonly used optical lenses are called customised spherical lenses, as they are delimited by spherical surfaces. In a lens constructed like this, the optical axis is defined as the straight line passing through the two centres of the spherical caps that delimit it. The optical axis is the line passing through the centre of the curvature radii of the surfaces and, in plano-convex or plano-concave lenses, this is perpendicular to the surface and passes through the centre of the curvature radius of the other surface.

The centre of the customised spherical lenses is the point that has the feature of not diverting the light radii. The most significant element of a lens is the focus, which is defined as the point where light beams that are travelling parallel to the optical axis will converge. Its distance from the centre of the lens is called the focal length and is usually denoted with the letter F.

To construct the image of an object produced by the customised spherical lenses, one usually follows the path of two particular radii: one that starts from the top of the object, passes through the lens parallel to the optical axis and is then diverted towards the focal point, and the other one that starts at the top of the object and passes directly through the centre of the lens and continues onwards without any deviation. The intersection of the two radii defines the image point.

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lenti

Lobre s.r.l. produces customised spherical lenses for industrial use, the production of objectives, condensers and projectors.

The models have the following features:

  • 4mm to 440mm diameter or irregular shapes (maximum diagonal 440mm)
  • Customised 2mm radii (concave or convex)
  • Surface Quality 60-40 (MIL Standards)
  • Centring up to 2 arcmins
  • Single or multi-layer anti-glare treatment (on request)
  • Design service (available on request)
  • Preferred working wavelength (from 250 nm to 1600 nm)

The materials used are normally:

  • Schott B270/ UVW76
  • Schott Borosilicate 33
  • Sodalime glass or similar

Other materials (such as optical glasses) can be used on request.
Field of application:

  • Rotating heads / Headlights for light show
  • LED lighting
  • Laser lighting (low power)
  • Cinema
  • Car
Alta-Qualità

Lobre s.r.l. manufactures customised spherical lenses for industrial use, for the production of objectives.

The models have the following features:

  • Diameter from 4mm to 310mm or irregular shapes (maximum diagonal 310mm) ± 0.01
  • Customised 2mm planar radii (concave or convex) ±0.0005
  • Surface quality up to 10-5 (MIL Standards)
  • Surface irregularity up to λ/10 per Ø<150mm, λ/5 for Ø<200mm, λ/2 for Ø>=200mm
  • Centring up to 30 arcsec
  • Single or multi-layer anti-glare treatment (on request)
  • Design service (available on request)
  • Preferred working wavelength (from 250 nm to 1600 nm)

The materials used are normally:

  • Ohara optical glass
  • CDGM optical glass
  • Schott optical glasses
  • Quartz

Other materials can be used on request.

Field of application:

  • Optical measuring systems
  • 2D and 3D video camera for digital or film sensors
  • Laser Systems
  • Cinema
  • Car
  • Aerospace
Doppietto

Lobre s.r.l. builds systems of 2 or more glued customised spherical lenses, which are designed to reduce the chromatic aberrations caused by the glass dispersion. The specifications are given below:

  • Diameter from 8mm to 150mm or irregular shapes (maximum diagonal 150mm)
  • Customised radii (see spherical lenses)
  • Single or multi-layer anti-glare treatment
  • Design service available on request
  • Preferred working wavelength (from 250 nm to 1600 nm)
KIT-Standard

The standard KIT case contains various types of lenses, useful for performing practical tests before switching to the definitive production of the system.

The KIT includes:

No. Part Number Type EFL (mm) Diameter (mm)
1 S.007781 Plano-convex BK7 75 50
2 S.007780 Plano-convex BK7 100 50
3 S.007782 Plano-convex BK7 125 50
4 S.007783 Plano-convex BK7 150 50
5 S.007784 Plano-convex BK7 200 50
6 S.007785 Plano-convex BK7 300 50
7 S.007786 Plano-convex BK7 400 50
8 S.007787 Plano-convex BK7 500 50
9 S.007788 Plano-convex BK7 750 50
10 S.007789 Plano-convex BK7 1000 50
A A013 Parabolic Condenser B270 35 52
G S.001474 Gobo in BOROFLOAT 50

The KIT is available with or without anti-glare treatment

Anti-glare treatment features:

  • Single layer, R <1.5% @ AOI 0 ° 450-650nm
  • Multi layer, R <0.5% @ AOI 0 ° 450-650nm

We are always available to create the most suitable KIT for our customers, contact us for a custom design.

Are you interested in our products?

Take a look at the Lobre catalogue now!